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If D is the greatest common divisor of A+7 and N, where N and A are in

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If D is the greatest common divisor of A+7 and N, where N and A are in  [#permalink]

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New post 06 Nov 2019, 02:01
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A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

69% (01:30) correct 31% (01:40) wrong based on 45 sessions

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Re: If D is the greatest common divisor of A+7 and N, where N and A are in  [#permalink]

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New post 06 Nov 2019, 06:16
Statement 1- We have no idea about value of A.
Insufficient

Statement 2- A+6 and A+7 are consecutive terms; hence, Both are co-primes. GCD(A+7, N)=D=1

Sufficient


Bunuel wrote:
If D is the greatest common divisor of A+7 and N, where N and A are integers. What is the value of D

(1) N = 20891
(2) N = A + 6


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Re: If D is the greatest common divisor of A+7 and N, where N and A are in  [#permalink]

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New post 10 Nov 2019, 05:24
1
(1) N = 20891
IF A = 20884 then A+7 = 20891 Then D is 20891
IF A = 2 then A+7 = 9 then D = 1
INSUFF

(2) N = A + 6
A+7 and A+6 are consecutive integers, hence GCD is 1
SUFF.
Ans- B
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Re: If D is the greatest common divisor of A+7 and N, where N and A are in  [#permalink]

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New post 10 Nov 2019, 05:51
) N = 20891
IF A = 20884 then A+7 = 20891 Then D is 20891
IF A = 2 then A+7 = 9 then D = 1
INSUFF

(2) N = A + 6
A+7 and A+6 are consecutive integers, hence GCD is 1
SUFF.
Ans- B
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Re: If D is the greatest common divisor of A+7 and N, where N and A are in   [#permalink] 10 Nov 2019, 05:51
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If D is the greatest common divisor of A+7 and N, where N and A are in

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