TestMagic

hardikrs · 2009 November 2nd, 03:16 AM

What is the greatest common divisor of positive integers m and n?

1. m is a prime number

2. 2n = 7m

Please explain your answer.

Thanks,

eravi11 · 2009 November 2nd, 05:43 AM

it's C

only when m=2 and n=7..
for all remaining cases m is even number and not prime number.....
2.7=7.2
2.14=7.4
2.21=7.6
2.28=7.8 and so on..

clock60 · 2009 November 2nd, 09:31 PM

my vote for C also
(1) m-prime insufficient ( no information about n)
(2) 2n=7m. n=7/2*m
m=2 n=7 LCD=1
m=4 n=14 LCD=2
two options-insuficient
together m-prime and n must be integer it possible only for m=2 and n=7
LCD=1 sufficient so C

2009 November 2nd, 03:16 AM	#1 (permalink)
hardikrs TestMagic Guru-in-Training Join Date: Apr 2008 Posts: 518	GPREP DS#17 What is the greatest common divisor of positive integers m and n? 1. m is a prime number 2. 2n = 7m Please explain your answer. Thanks,

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

2009 November 2nd, 05:43 AM	#2 (permalink)
eravi11 So far So bad! Join Date: Feb 2009 Posts: 631	it's C only when m=2 and n=7.. for all remaining cases m is even number and not prime number..... 2.7=7.2 2.14=7.4 2.21=7.6 2.28=7.8 and so on..

2009 November 2nd, 09:31 PM	#3 (permalink)
clock60 TestMagic Guru-in-Training Join Date: May 2009 Posts: 726	my vote for C also (1) m-prime insufficient ( no information about n) (2) 2n=7m. n=7/2*m m=2 n=7 LCD=1 m=4 n=14 LCD=2 two options-insuficient together m-prime and n must be integer it possible only for m=2 and n=7 LCD=1 sufficient so C

TestMagic

Free GMAT, GRE, SAT Test, TOEFL practice tests