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Conceptual>Rapid Fire GMATQuiz [#permalink]
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10 Dec 2016, 06:13
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Aloha..!!! DAY1 Topic > Number Properties RAPID FIRE QUIZ1 Note >Answering these Questions Shouldn't take us more than a minute/QuestionSource >Few are from Egmat forum and the rest are Self made Quote:
1)If p,q,r are positive integers such that p<q<r,then what is the maximum possible value of GCD of p,q,r.? A)p B)q C)r D)1 E)p*q*r
2)If x and n are positive integers then the number of prime factors of nx will always be greater than or equal to the number of prime factors of x^n? A)True B)False C)cannot be determined
3)If p,q,r are positive integers such that p<q<r,then what is the minimum possible value of LCM of p,q,r.? A)p B)q C)r D)1 E)p*q*r
4)If P is cube of a prime number, then how many factors does P have?
5)If P and Q are Prime numbers then Q^5+P*Q is always even? A)True B)False
6)Is 24175 a prime number ? A)True B)False
7)The sum of first 100 prime number is even? A)True B)False
8)If x is a positive integer such that x29,x and x+6 are all prime numbers,what is the value of x?
9)If n and x are positive integers such that x^379 is divisible by 2 and n=x^3x, then n is always divisible by 24? A)True B)False
10)If P is a perfect Square, then which of these may be the number of prime factors of P? A)13 B)12 C)10 D)8 E)6
11)All the prime numbers greater than 3 can be written as either 6n+1 or 6n1. A)True B)False
12)All the positive integers of the form 6n+1 or 6n1 are prime numbers. A)True B)False
13)If a positive integer x has 11 factors,how many prime factors does it have?
One.Notice that 11 is a prime number
14)If x is a positive integer then what will be the remainder when 10^x is divided by 3?
15)If a and b are positive integers such that a>b and a*b is a prime number.If a is even then what is the value of a*b? A)2 B)4 C)6 D)8 E)Cannot be determined
16)If the sum of N consecutive integers is an integer,then N must be even. A)True B)False
17)x^3+x^2+x^37+x^4 is never odd if x is an integer.? A)True B)False
18)If Prime factors of a positive integer x include 2,3,5,7 and 13,then what will the units digit of x?
19)The units digit of 3^49 +5^34 +8^5 is ?
20)For two positive integers p and q if LCM(p,q)=GCD(p,q),then which if the following must be true? A)p>q B)p≥q C)p<q D)p≤q E)p=q
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Last edited by stonecold on 24 Dec 2016, 00:45, edited 2 times in total.
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Re: Conceptual>Rapid Fire GMATQuiz [#permalink]
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10 Dec 2016, 07:12
8)If x is a positive integer such that x29,x and x+6 are all prime numbers,what is the value of x?
bit confused on the answer as 5.
529 is 24.
I was thinking 31 as the answer?
am I missing some concept ?



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Re: Conceptual>Rapid Fire GMATQuiz [#permalink]
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10 Dec 2016, 07:17
Dev1212 wrote: 8)If x is a positive integer such that x29,x and x+6 are all prime numbers,what is the value of x?
bit confused on the answer as 5.
529 is 24.
I was thinking 31 as the answer?
am I missing some concept ? No Dev. You are Absolutely Right. I made a typing error. And thank you for attempting the Quiz. I Hope it helped. Regards Stone Cold
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Re: Conceptual>Rapid Fire GMATQuiz [#permalink]
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10 Dec 2016, 07:21
Thank You StoneCold. It is indeed helpful mate. Hell Yeahhh !!! That's the bottom line 'coz Stone Cold said so ! +1 mate stonecold wrote: Dev1212 wrote: 8)If x is a positive integer such that x29,x and x+6 are all prime numbers,what is the value of x?
bit confused on the answer as 5.
529 is 24.
I was thinking 31 as the answer?
am I missing some concept ? No Dev. You are Absolutely Right. I made a typing error. And thank you for attempting the Quiz. I Hope it helped. Regards Stone Cold



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Re: Conceptual>Rapid Fire GMATQuiz [#permalink]
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15 Dec 2016, 22:34
Quote: 3)If p,q,r are positive integers such that p<q<r,then what is the minimum possible value of LCM of p,q,r.? A)p B)q C)r D)1 E)p*q*r
[Obscure] Spoiler: r Hi stonecold, I don't know how to approach this one could you clarify. In such questions i generally choose numbers so i took p= 1,q= 2,r= 3; L.C.M= 6(or in this case p*q*r) This is maximum possible value of LCM Now,how do you find the minimum??



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Re: Conceptual>Rapid Fire GMATQuiz [#permalink]
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16 Dec 2016, 01:05
1)If p,q,r are positive integers such that p<q<r,then what is the maximum possible value of GCD of p,q,r.? A)p B)q C)r D)1 E)p*q*r I love this sum. It is pure concept. We will go by one by one options 1 can be GCD if P Q R is Co – prime to each other. P*Q*R – can be LCM, but never a GCD. Within P,Q,R – only the smallest number can be GCD – to understand this you may chose 3 numbers. Write them in their canonical form. From that to find GCD we will take common factors with their lowest power, so the small number P only can be GCD.
2)If x and n are positive integers then the number of prime factors of nx will always be greater than or equal to the number of prime factors of x^n? A)True B)False C)cannot be determined I am not sure how to explain this, but I choose few numbers and tested. It is always true. 3)If p,q,r are positive integers such that p<q<r,then what is the minimum possible value of LCM of p,q,r.? A)p B)q C)r D)1 E)p*q*r Same as first qs. P*q*r is maximum LCM possible R is the minimum LCM possible. As I told early you can try it by the way I mentioned in first qs.
4. If P is cube of a prime number, then how many factors does P have? The number of factors can be found by adding one to the power. So four in this case. Another example how to find factors: 23 * 32 = (3+1) * (2+1) = 4*3 =12 factors
5)If P and Q are Prime numbers then Q^5+P*Q is always even? Interesting one, the problem in the sum is with prime number 2. If they say p and Q are >2 then it would be different.



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Re: Conceptual>Rapid Fire GMATQuiz [#permalink]
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16 Dec 2016, 07:24
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karanchamp1 wrote: Quote: 3)If p,q,r are positive integers such that p<q<r,then what is the minimum possible value of LCM of p,q,r.? A)p B)q C)r D)1 E)p*q*r
[Obscure] Spoiler: r Hi stonecold, I don't know how to approach this one could you clarify. In such questions i generally choose numbers so i took p= 1,q= 2,r= 3; L.C.M= 6(or in this case p*q*r) This is maximum possible value of LCM Now,how do you find the minimum?? Hi karanchamp1
When two or more numbers are involved => LCM can never be less than any of the numbers(Since all the numbers are factors to the LCM and A factor of any number can never be greater than the number itself ) Hence > Least value of LCM possible = Highest of all the numbers involved.In this case r will the least LCM.
The same rule can be Applied for GCD as => GCD can never be greater than any of the involver numbers(As GCD is a factor to each number and A factor of any number can never be greater than the number itself) Hence > Highest value of GCD = Smallest of all the numbers involved,which would be p in this case.
Thank you for attempting the Quiz. I hope it was helpful .
Regards Stone Cold
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Re: Conceptual>Rapid Fire GMATQuiz [#permalink]
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16 Dec 2016, 09:11
stonecold wrote: karanchamp1 wrote: Quote: 3)If p,q,r are positive integers such that p<q<r,then what is the minimum possible value of LCM of p,q,r.? A)p B)q C)r D)1 E)p*q*r
[Obscure] Spoiler: r Hi stonecold, I don't know how to approach this one could you clarify. In such questions i generally choose numbers so i took p= 1,q= 2,r= 3; L.C.M= 6(or in this case p*q*r) This is maximum possible value of LCM Now,how do you find the minimum?? Hi karanchamp1
When two or more numbers are involved => LCM can never be less than any of the numbers(Since all the numbers are factors to the LCM and A factor of any number can never be greater than the number itself ) Hence > Least value of LCM possible = Highest of all the numbers involved.In this case r will the least LCM.
The same rule can be Applied for GCD as => GCD can never be greater than any of the involver numbers(As GCD is a factor to each number and A factor of any number can never be greater than the number itself) Hence > Highest value of GCD = Smallest of all the numbers involved,which would be p in this case.
Thank you for attempting the Quiz. I hope it was helpful .
Regards Stone Cold
Hi stonecold Thanks for the prompt explanation man, and your quiz is is really intriguing and fun to solve Also, You've got any similar thread of hard questions on inequalities,I find them really confusing sometimes (there are so many cases and I always miss that one exceptional case).It would really be helpful. I feel like a parasite sucking all the resources in ,Dday is coming next month ,hope you understand Thanks again and KUDOS!!



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Re: Conceptual>Rapid Fire GMATQuiz [#permalink]
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16 Dec 2016, 09:34
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karanchamp1 wrote: stonecold wrote: Hi karanchamp1
When two or more numbers are involved => LCM can never be less than any of the numbers(Since all the numbers are factors to the LCM and A factor of any number can never be greater than the number itself ) Hence > Least value of LCM possible = Highest of all the numbers involved.In this case r will the least LCM.
The same rule can be Applied for GCD as => GCD can never be greater than any of the involver numbers(As GCD is a factor to each number and A factor of any number can never be greater than the number itself) Hence > Highest value of GCD = Smallest of all the numbers involved,which would be p in this case.
Thank you for attempting the Quiz. I hope it was helpful .
Regards Stone Cold
Hi stonecold Thanks for the prompt explanation man, and your quiz is is really intriguing and fun to solve Also, You've got any similar thread of hard questions on inequalities,I find them really confusing sometimes (there are so many cases and I always miss that one exceptional case).It would really be helpful. I feel like a parasite sucking all the resources in ,Dday is coming next month ,hope you understand Thanks again and KUDOS!! I am Glad you liked the Quiz.
I am working on a similar Quiz on Statistics. On the GMAT Statistics is very Crucial.(or so i have heard) It will be up in a day or two. And it will have everything you need for Statistics.
Now,Coming to your Doubt on inequality here is my suggestion =>
If you are looking for conceptual understanding,then go through this Post by Bunuel > inequalitiesmadeeasy206653.html
Next Download this PDF Here => 50gmatdatasufficiencyquestionsoninequalities167841.html
It has 50 Great Hand Picked Inequality Questions.
After solving each of these 50 Questions > I think you will ready to fight inequalities.
Regards Stone Cold
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Re: Conceptual>Rapid Fire GMATQuiz [#permalink]
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16 Dec 2016, 09:45
stonecold wrote: karanchamp1 wrote: stonecold wrote: Hi karanchamp1
When two or more numbers are involved => LCM can never be less than any of the numbers(Since all the numbers are factors to the LCM and A factor of any number can never be greater than the number itself ) Hence > Least value of LCM possible = Highest of all the numbers involved.In this case r will the least LCM.
The same rule can be Applied for GCD as => GCD can never be greater than any of the involver numbers(As GCD is a factor to each number and A factor of any number can never be greater than the number itself) Hence > Highest value of GCD = Smallest of all the numbers involved,which would be p in this case.
Thank you for attempting the Quiz. I hope it was helpful .
Regards Stone Cold
Hi stonecold Thanks for the prompt explanation man, and your quiz is is really intriguing and fun to solve Also, You've got any similar thread of hard questions on inequalities,I find them really confusing sometimes (there are so many cases and I always miss that one exceptional case).It would really be helpful. I feel like a parasite sucking all the resources in ,Dday is coming next month ,hope you understand Thanks again and KUDOS!! I am Glad you liked the Quiz.
I am working on a similar Quiz on Statistics. On the GMAT Statistics is very Crucial.(or so i have heard) It will be up in a day or two. And it will have everything you need for Statistics.
Now,Coming to your Doubt on inequality here is my suggestion =>
If you are looking for conceptual understanding,then go through this Post by Bunuel > inequalitiesmadeeasy206653.html
Next Download this PDF Here => 50gmatdatasufficiencyquestionsoninequalities167841.html
It has 50 Great Hand Picked Inequality Questions.
After solving each of these 50 Questions > I think you will ready to fight inequalities.
Regards Stone ColdThanks man,these threads will suffice for now You are the best KUDOS!!!!!!!!!!!!!!!!!



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Re: Conceptual>Rapid Fire GMATQuiz [#permalink]
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06 Jan 2017, 23:28
StoneCold this was massively helpful. It tested my concepts and in fact pushed me to think a bit further. Thank you for this!



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Re: Conceptual>Rapid Fire GMATQuiz [#permalink]
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15 Jan 2017, 13:34
deeksha6 wrote: StoneCold this was massively helpful. It tested my concepts and in fact pushed me to think a bit further. Thank you for this! Thank you for the Feedback. Appreciate it. Here is another mock test for you to solve > http://gmatclub.com/forum/stonecoldsmocktest217160.html#p1676182
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Conceptual>Rapid Fire GMATQuiz [#permalink]
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15 Jan 2017, 13:39
A New Mock test has been Updated http://gmatclub.com/forum/stonecoldsmocktest217160.html#p1676182Number of Questions > 100.
Topics Covered > Basic Concepts of Divisibility,factors and Primes
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Re: Conceptual>Rapid Fire GMATQuiz [#permalink]
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17 Jan 2017, 05:49
A New Mock test has been Updated http://gmatclub.com/forum/stonecoldsmocktest217160.html#p1765951 Number of Questions> 100.
Topics Covered > Advanced Concepts of >Divisibility,factors and Primes Difficulty Level> 700+
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Re: Conceptual>Rapid Fire GMATQuiz [#permalink]
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24 Jan 2017, 20:57



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Re: Conceptual>Rapid Fire GMATQuiz [#permalink]
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25 Jan 2018, 18:21
10)If P is a perfect Square, then which of these may be the number of prime factors of P? A)13 B)12 C)10 D)8 E)6 can you explain this question, I agree that total no of factors shall be odd, but the number of prime factors can be any numbers.For example take 13 prime numbers say (p1, p2, p3....p13) Now the number P = (p1*p2*p3*...p13)^2 is a perfect square having 13 prime factors.Please correct me, if I miss anything. stonecold wrote: Aloha..!!! :eat :zoom :beatup DAY1 Topic > Number Properties RAPID FIRE QUIZ1 Note >Answering these Questions Shouldn't take us more than a minute/QuestionSource >Few are from Egmat forum and the rest are Self made Quote:
1)If p,q,r are positive integers such that p<q<r,then what is the maximum possible value of GCD of p,q,r.? A)p B)q C)r D)1 E)p*q*r
2)If x and n are positive integers then the number of prime factors of nx will always be greater than or equal to the number of prime factors of x^n? A)True B)False C)cannot be determined
3)If p,q,r are positive integers such that p<q<r,then what is the minimum possible value of LCM of p,q,r.? A)p B)q C)r D)1 E)p*q*r
4)If P is cube of a prime number, then how many factors does P have?
5)If P and Q are Prime numbers then Q^5+P*Q is always even? A)True B)False
6)Is 24175 a prime number ? A)True B)False
7)The sum of first 100 prime number is even? A)True B)False
8)If x is a positive integer such that x29,x and x+6 are all prime numbers,what is the value of x?
9)If n and x are positive integers such that x^379 is divisible by 2 and n=x^3x, then n is always divisible by 24? A)True B)False
10)If P is a perfect Square, then which of these may be the number of prime factors of P? A)13 B)12 C)10 D)8 E)6
11)All the prime numbers greater than 3 can be written as either 6n+1 or 6n1. A)True B)False
12)All the positive integers of the form 6n+1 or 6n1 are prime numbers. A)True B)False
13)If a positive integer x has 11 factors,how many prime factors does it have?
One.Notice that 11 is a prime number
14)If x is a positive integer then what will be the remainder when 10^x is divided by 3?
15)If a and b are positive integers such that a>b and a*b is a prime number.If a is even then what is the value of a*b? A)2 B)4 C)6 D)8 E)Cannot be determined
16)If the sum of N consecutive integers is an integer,then N must be even. A)True B)False
17)x^3+x^2+x^37+x^4 is never odd if x is an integer.? A)True B)False
18)If Prime factors of a positive integer x include 2,3,5,7 and 13,then what will the units digit of x?
19)The units digit of 3^49 +5^34 +8^5 is ?
20)For two positive integers p and q if LCM(p,q)=GCD(p,q),then which if the following must be true? A)p>q B)p≥q C)p<q D)p≤q E)p=q
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