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Veritas Prep 10 Year Anniversary Promo Question #7

One quant and one verbal question will be posted each day starting on Monday Sept 17th at 10 AM PST/1 PM EST and the first person to correctly answer the question and show how they arrived at the answer will win a free Veritas Prep GMAT course ($1,650 value). Winners will be selected and notified by a GMAT Club moderator. For more questions and details please check here: veritas-prep-10-year-anniversary-giveaway-138806.html

To participate, please make sure you provide the correct answer (A,B,C,D,E) and explanation that clearly shows how you arrived at it. Winners will be announced the following day at 10 AM Pacific/1 PM Eastern Time.

What is the value of integer z?

(1) z is the remainder when positive integer y is divided by positive integer (y - 1)

This question is a classic “Why Are You Here?” question. Statement 1 may look sufficient if you pick numbers (8 and 7; 15 and 14; 5 and 4 → the remainder is always 1). But what about 2 and 1? There’s no remainder there, so z would equal 0. This is why statement 2 is so important. Alone, it’s useless...so why is it there? Statement 2 tells us that (y - 1) cannot be 1, because y cannot be 2. This takes away that one flaw with statement 1, and means that both statements together are sufficient. But of more strategic importance, statement 2 should alert you to that problem with statement 1. Most test-takers miss that flaw when looking at statement 1 alone, but astute test-takers will reconsider once statement 2 is presented. _________________

(1) z is the remainder when positive integer y is divided by positive integer (y - 1) (2) y is not a prime number Answer is C 1 insufficient as remainder can be 1, 2 2) insufficient 3) both sufficient _________________

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Option C. Since y-1 is positive.. y has to be atleast 2. now for any y>2, y/y-1 will give 1 as remainder but for Y=2 remainder is 0. however y is not prime.. so can not be 2. hence we know remainder will be 1 from above.

Last edited by Manjulika on 20 Sep 2012, 09:46, edited 1 time in total.

Veritas Prep 10 Year Anniversary Promo Question #7

One quant and one verbal question will be posted each day starting on Monday Sept 17th at 10 AM PST/1 PM EST and the first person to correctly answer the question and show how they arrived at the answer will win a free Veritas Prep GMAT course ($1,650 value). Winners will be selected and notified by a GMAT Club moderator. For more questions and details please check here: veritas-prep-10-year-anniversary-giveaway-138806.html

To participate, please make sure you provide the correct answer (A,B,C,D,E) and explanation that clearly shows how you arrived at it. Winners will be announced the following day at 10 AM Pacific/1 PM Eastern Time.

What is the value of integer z?

(1) z is the remainder when positive integer y is divided by positive integer (y - 1)

(2) y is not a prime number

Ans: A

Z = 1

y-1 and y are two consecutive numbers. When divided it will give remainder 1 _________________

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Ans is C Statement1: for ex y=2 2/1 then remainder =0 if y=3 3/2 then remainder=1 Not sufficient Statement2: y can be 1,4,6 ---Not sufficent By combining both y cannot be 2,so in all cases remainder will be 1 Hence sufficient

Veritas Prep 10 Year Anniversary Promo Question #7

One quant and one verbal question will be posted each day starting on Monday Sept 17th at 10 AM PST/1 PM EST and the first person to correctly answer the question and show how they arrived at the answer will win a free Veritas Prep GMAT course ($1,650 value). Winners will be selected and notified by a GMAT Club moderator. For more questions and details please check here: veritas-prep-10-year-anniversary-giveaway-138806.html

To participate, please make sure you provide the correct answer (A,B,C,D,E) and explanation that clearly shows how you arrived at it. Winners will be announced the following day at 10 AM Pacific/1 PM Eastern Time.

What is the value of integer z?

(1) z is the remainder when positive integer y is divided by positive integer (y - 1)

(2) y is not a prime number

(E) (1) INSUFF because values will be diffrent if y is even or odd so z will vary (2) insufficient to answer the given question together also, not possible to figure out z _________________

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(1) is the remainder when positive integer y is divided by positive integer

(2) is not a prime number

the answer is E y and y-1 is consequetive integers so y divided by y-1 results remainder of 1 which is unknown INSUFFICIENT 2 is clearly INSUFFICIENT together is also INSUFFICIENT to say the value of z because when y is 1 y-1 will be 0 which cannot be the case and 1 is not a prime

Last edited by SobirovaZulxumor on 20 Sep 2012, 09:31, edited 2 times in total.

Statement 1-z is the remainder when positive integer y is divided by positive integer (y - 1)- not sufficient the nos can vary Statement 2- By itself also not sufficient to find Z Together also not sufficient. _________________

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(1)y/(y-1)=1+1/(y-1); since z is integer so (y-1) must be 1 or -1. But y-1>0. Then,(y-1) must be 1 => z=1=>(1)Sufficient (2)y is not prime number is not Sufficient. So A

(1) is the remainder when positive integer y is divided by positive integer

(2) is not a prime number _________________

Statement 1 is sufficient - Y is a positive number so 1, 2,3,......... and Y-1 is also a Positive number, therefore minimum value of Y can be either 2, 3, 4, etc. ... and remainder always be 1, So value of Z is 1 statement 2- Y is not a prime number, Since it is a positive number so it will again the number can be 4, 6 , 8, 9, 10 etc. and Y-1 will always result in 1 less than the number itself... So Remainder will be 1

(1) z is the remainder when positive integer y is divided by positive integer (y - 1) (2) y is not a prime number Answer is C 1 insufficient as remainder can be 1, 2 2) insufficient 3) both sufficient

How remainder can be 2 in statement1...Obviously not possible

Numbers of the form (y,y-1) are called coprimes because they have only 1 common factor and that is 1. The only scenario when y divided by y-1 will give a remainder 0 is when y is 2 but since statement says that, y cannot be a prime number. So both the statements together are sufficient to answer the question.