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The Equation would be =
4a+b = 11X+b ( Since remainder is the same)
4a = 11X
and combination of a and X exists are (0,0), (11,4), (22,8) - for every combination, there exist 3 integers which have the same remainder when divided by 4 and 11. so there will be 9 integers.
Bunuel
How many positive integers less than 100 have the same remainder upon division by 4 as upon division by 11?

A. 8
B. 9
C. 10
D. 11
E. 12


 


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We can define the equations as :

N = 4a + r
N = 11b + r

So 4a and 11b must be a multiple of 4 x 11 => Consider 0, 44, 88

Also, max remainder that can be left when dividing by 4 is 3 so 0,1,2,3

We need only positive integers so between 0 - 43 : 1, 2, 3 are suitable

Between 44 - 87 : 44, 45, 46, 47 are suitable

Between 88 - 99 : 88, 89, 90, 91 are suitable

So, 3 + 4 + 4 = 11 total numbers (D)
Bunuel
How many positive integers less than 100 have the same remainder upon division by 4 as upon division by 11?

A. 8
B. 9
C. 10
D. 11
E. 12


 


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And D- 11
Please see attachment
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The remainder when divided by 4 will follow a pattern 0, 1, 2, 3, 0, 1, 2, 3, and so on...
The remainder when divided by 11 will follow a pattern 0, 1, 2, 3, ...., 9, 10, 0, 1, 2, 3, ..., 8, 9, 10, 0, 1, ..., 9, 10, and so on.

The integers 1, 2, 3 will return a remainder of 1, 2 and 3 respectively when divided by 4 and 11 both.

After that, the remainder will start changing. The remainder when divided by 4 and 11 will next become 0 simultaneously at 44, which is the LCM of 4 and 11. Now, the pattern would repeat. 45, 46, 47 would return remainders 1, 2 and 3 for both 4 and 11 (this is similar to what we observed with integers 1, 2 and 3 at the start).

Then at 88, it will again return remainder 0 for both 4 and 11. 89, 90, 91 will return remainder 1, 2 and 3 respectively. This gives us total of 3 + 4 + 4 = 11 integers.
Bunuel
How many positive integers less than 100 have the same remainder upon division by 4 as upon division by 11?

A. 8
B. 9
C. 10
D. 11
E. 12


 


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Answer is (D) 11

Any number when divided by 4, can leave a remainder of 0, 1, 2 or 3.
Any number when divided by 11, can leave a remainder of 0 to 10

If we compare these two, we need numbers that when divided by 4 and 11, can leave the same remainder of 0, 1, 2 or 3

Right of the bat, we can say that the numbers 1, 2 and 3 satisfy this condition. (We exclude 0 as 0 is not a positive number, it is non-negative)

Also, knowing the basic concept of remainder, if we want to find a set of numbers that leave the same remainder when divided by two different divisors, we can find the initial numbers that satisfy the condition and add the multiples of the LCM of the two divisors and add to them.

The LCM of 4 and 11 is 44.
Thus, adding 44 to 0, 1, 2 and 3 we get, 44, 45, 46 and 47.
Also, we can see that we can also add 88 (multiple of the LCM 44) to still get numbers which satisy the condition of the numbers being less than 100.
Thus we also get 88, 89, 90, 91

Hence, the set of required numbers is {1, 2, 3, 44, 45, 46, 47, 88, 89, 90, 91}


Even if we did not know the above principle of adding multiples of 11, you can quickly try a few numbers that leave a remainder of 0, 1, 2 and 3 when divided by 11 and divide them by 4 to see if there are any numbers that satisfy the condition. We will have to try roughly 40 numbers. So its handy to know the principle.
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My Answer- D. 11

Remainders common with both 4 & 11 is remainders = 0, 1, 2 or 3 as these are the only possible remainders for 4.

Our valid integers for this would be 1,2,3- both with same remainders for both 4 & 11 - 3 nos
Then LCM of 4 & 11- 44 as it gives both a remainder of 0 - 1 nos
Then 45,46,47 as all 3 will give remainder of 1,2,3 respectively - 3 nos

We repeat this process again with 44*2 =88 for the next common integer to get a remainder 0 - 1 nos
And then similarly 89,90,91 will give us remainders 1,2,3 - 3 nos

Hence 11 nos
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LETS COUNT

1 ,2, 3 HAVE SAME REMAINDER WHETHER DIVIDED BY 4 AND 11. THEY WILL BE REMAINED ITSELF,


BASICALLY, n=4q+r and n=11Q+r so n-r=4q and n-r=11Q so 4q=11Q , this is only possible when q=11 and Q=4, q=22 and Q=8

Also remainder r can be 0,1,2 ,3 beyond that remainder will be divisible by 4 and repeat 0, 1, 2 ,3

put q=11 and r=0, 1, 2 , 3 we get n=44,45,446,47
put q=22 and r=0,1,2,3 we get n= 88,89, 90, 91

8 numbers from here and 3 numbers we discussed on the top. total 11 numbers
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integer can be : 4p+r,(0,1,2,3) 11q+r(0,1,...,10)
now the integers leaving same remainder will be 44 m + r where r = 0,1,2,3
m = 0, I = 0,1,2,3(we need positive so no 0) = 3
m = 1, I = 44,45,46,47 = 4
m = 2, I = 88,89, 90, 91 = 4
m = 3, >100 = 0
total = 4+4+3 = 11.
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Remainders for 4 = 1,2,3,0
Remainders for 11= 1,2,3,4,5,6,7,8,9,10,0
So need to consider numbers with 1,2,3,0 remainders for both.

So, for zero remainder, the numbers are 44, 88. - 2
for 1=> 1, 45, 89
for 2=> 2, 46, 90
for 3=> 3, 47, 91
So total number of cases are 2+3+3+3 = 11
Option D

Bunuel
How many positive integers less than 100 have the same remainder upon division by 4 as upon division by 11?

A. 8
B. 9
C. 10
D. 11
E. 12


 


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Given condition:
A positive integer below 100 that when divided by both 4 and 11 has the same remainder.

Let each positive integer which meets the above condition be n and the remainder obtained when dividing n by 4 or 11 be r.
Hence, we can write n mod 4 = r and n mod 11 = r where n and r are equal.

We know, if a number is divided by 4, the remainder can only be either 1, 2, 3 or 0. Hence, r can have only 4 possible values which are 0, 1, 2 and 3.

Now, since dividing n by 4 and 11 gives us r in each of these cases, subtracting r from n should give us a number which is divisible by both 4 and 11, and hence, the result of n - r must be a multiple of both 4 and 11. This also then goes to follow that n - r must be a multiple of the LCM of 4 and 11, which is 4 x 11 = 44 (since the two numbers share no common factors other than 1).
Therefore, n - r can be expressed as a multiple of 44 i.e., n - r = 44x. Here, x is a constant non-negative integer value.

Now, lets look at each case for different values of x which satisfy the given condition:
Case 1: x = 0. Hence, n - r = 0 or n = r. And we already established above that r can have 4 values, which are 0, 1, 2 and 3. Hence, n can be 0, 1, 2 and 3. But, the condition mentions that n must be a positive integer hence n cannot be 0. Therefore, n can be 1, 2, or 3. This gives us 3 values of n.

Case 2: x = 1. Hence n - r = 44 or n = 44 + r. And we know r can be 0, 1, 2 and 3. Hence, n can be 44, 45, 46 or 47. This gives us 4 valid values of n.

Case 3: x = 2. Hence, n - r = 88 or n = 88 + r. Hence, similarly as in case 2, n can be 88, 89, 90 or 91. This also gives us 4 valid values of n.

Case 4: x = 3. Hence, n - r = 132. This won't be valid since the value of n in this case, and for any higher values of x, will be >100. So, we stop here.

Therefore, the total number of valid values of n are 3 + 4 + 4 = 11.

Final Answer: D. 11
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Same remainder on division of 4 as division of 11 indicates that we need to look at multiples of 44.

Initially we look at: 1, 2, 3. Here, we get 3.

44, 45, 46, 47 these will given the same remainder if divided by either 4 / 11. Remainder for 4 then resets at 48. Here, we got 4.

Similar for numbers on the 88 side: 88, 89, 90, 91. Again, we got 4.

Thus, 3+4+4= 11 OPTION D
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n=r (mod 4), n=r (mod 11)
subtract
n-r must be divisible by both 4 and 11
LCM(4,11)=44
n=44k+r
r is a remainder for division by 4 so:
r=0,1,2,3
how many integers are in less than 100
k=0,
n=r, (1,2,3)= 3 numbers
k=1
44,45,46,47 = 4 numbers
k=2
88,89,90,91 =4 numbers
k=3
132+r>100
Total: 3+4+4=11
ANS: D. 11
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when num is divided by 4, it leaves remainder of 1,2 or 3.

so whether you divide num 1,2,3 by 4 or 11, it leaves remainder of 1,2 ad 3.

so the next num,we can find the LCM of 4 and 11. LCM is 44. now multiple of 44 is 44,88,132,... but we cant take 132 since its greater than 100.

so the next three values after 44 are 45,46,47. all of wich leaves remainder of 1,2,3 when divided by either 4 or 11.
the next three values after 88 are 89,90,91. all of which leaves remainder of 1,2,3 when divided by either 4 or 11.

so total values; 1,2,3,45,46,47,89,90,91.

choice B
Bunuel
How many positive integers less than 100 have the same remainder upon division by 4 as upon division by 11?

A. 8
B. 9
C. 10
D. 11
E. 12


 


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We are asked to find numbers that are when divided by 4 and 11 give the same remainder. Lets check the remainder pattern for both numbers
Number:1,2,3,4,5,6,7,8,9,10,11
Remainder when divided by 4: 1,2,3,0,1,2,3,0,1,2,3
Number:1,2,3,12,13,14,23,24,25......91
Remainder when divided by 11: 1,2,3,1,2,3,1,2,3
So we require number that gives the remainders (1,2,3) for both 4 and 11:

If we group the numbers in threes and realize that if the number sequence of remainders does not start with 1 at the first number than it is not our number group
(1,2,3) (12,13,14) (23,24,25) ..... (89,90,91)
Numbers that we are looking for are = (1,2,3) (45,46,47) (89,90,91)
Ans B
IMO
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IMO B

As per Q, I have to find nos btween 1,.... ,100, (1 inclusive, 100 exclusive), such that 4 & 11 have same remainder
Then clearly : 1,2,3 satifies this
Also the multiple of 4 & 11= 44, nos after this 45, 46,47 - satifies the condition mentioned
Second multiple of 44 = 44 x2=88,nos after this 89,90,91 satifies the condition
Hence 9 nos : 1,2,3,45,46,47, 89,90,91 are required nos
Hope this helps!
Bunuel
How many positive integers less than 100 have the same remainder upon division by 4 as upon division by 11?

A. 8
B. 9
C. 10
D. 11
E. 12


 


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Any number divided by 4 can have only the following remainders 0 , 1 , 2 , 3

Now for remainder of 0, there will be 2 nos i.e 44 and 88

For remainder of 1: There will be 3 nos i.e if we have two equations 4k+1 and 11q+1 the way to find values satisfying both equations is LCMx + first common value

Hence first common value is 1, so the next values will be 1 + 44 = 45 and then 45 + 44 i.e 89

Similarly values for remainder of 2 will be 2, 2+44 , 2 + 44 + 44 i.e 2 , 46 , 90

For remainder of 3, values will be 3, 47 and 91

Hence total 11 values. I ll go with option D



Bunuel
How many positive integers less than 100 have the same remainder upon division by 4 as upon division by 11?

A. 8
B. 9
C. 10
D. 11
E. 12


 


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4 Can have remainders 0, 1, 2 and 3.
SO if we take the LCM of 4 and 11 we get 44. So we can write numbers in the form of n = 44x + r.

For n>0 and <44 the possible remainders can be 1, 2, 3. We cannot consider 0 because in the question its given positive numbers less than 100.

Where x = 1 the numbers can be 44-87. Here remainders are 0, 1, 2 and 3.
If x = 2, the numbers can be 88-99 the remainders can be 0, 1, 2, 3.
So summing them up we get 3 + 4 + 4 = 11.
IMO Ans is D.
Bunuel
How many positive integers less than 100 have the same remainder upon division by 4 as upon division by 11?

A. 8
B. 9
C. 10
D. 11
E. 12


 


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