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24 Dec 2020, 01:15
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
69% (01:09) correct
31%
(01:16)
wrong
based on 88
sessions
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What is the greatest common divisor of two positive integers x and y?
(1) x + y = 9
(2) x and y are consecutive multiples of 3
(1) x + y = 9
(2) x and y are consecutive multiples of 3
Bryan180599
Joined: 07 Nov 2020
Last visit: 25 Mar 2022
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Given Kudos: 44
Location: Belgium
Schools: HEC MFin "23 ESSEC ESCP Europe HEC MiM "25
GMAT 1: 710 Q48 V38
Updated on: 24 Dec 2020, 05:29
Originally posted by Bryan180599 on 24 Dec 2020, 03:53.
Last edited by Bryan180599 on 24 Dec 2020, 05:29, edited 1 time in total.
Last edited by Bryan180599 on 24 Dec 2020, 05:29, edited 1 time in total.
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What is the greatest common divisor of two positive integers x and y?
(1) x + y = 9
Insufficient. Not enough information, x can be 5 and y 4 ==> No common divisor. But x=3 y=6 common divisor of 3
(2) x and y are consecutive multiples of 3
Sufficient. If x=3 y=6 ==> GCD is 3 but if x=18 (3*3*2) and y=21 (7*3) GCD is 3
Answer B
(1) x + y = 9
Insufficient. Not enough information, x can be 5 and y 4 ==> No common divisor. But x=3 y=6 common divisor of 3
(2) x and y are consecutive multiples of 3
Sufficient. If x=3 y=6 ==> GCD is 3 but if x=18 (3*3*2) and y=21 (7*3) GCD is 3
Answer B
callmeDP
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24 Dec 2020, 04:55
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IMO B
1. x=3 & y=6 ; GCD will be 3
x =4 & y=5 ; GCD will be 1.
Not sufficient.
2. x = 3*k and y = 3*(k+1)
Here, due to the odd-even possibility; GCD will be 3 always.
Sufficient.
1. x=3 & y=6 ; GCD will be 3
x =4 & y=5 ; GCD will be 1.
Not sufficient.
2. x = 3*k and y = 3*(k+1)
Here, due to the odd-even possibility; GCD will be 3 always.
Sufficient.
