Is 13 a factor of M?

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netcaesar: Junior | Next Rank: 30 Posts; Posts: 29; Joined: Thu Sep 25, 2008 5:11 pm

by netcaesar » Mon Sep 07, 2009 3:14 pm

Is 13 a factor of M?
a) 117 M is the square of an integer
b) M/117 is the square of an integer

Source: Beat The GMAT — Data Sufficiency | Mon Sep 07, 2009 3:14 pm

praky_rules: Senior | Next Rank: 100 Posts; Posts: 45; Joined: Wed Jun 11, 2008 4:25 pm; Thanked: 4 times; GMAT Score:730

by praky_rules » Mon Sep 07, 2009 7:07 pm

1. 117 =13x3^2. For 117M to be a square, M must have a 13 in it! sufficient

2.M must have 117 as a factor, so 13 is a factor. sufficient.

D

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