Prime Factors

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sparkle6: Senior | Next Rank: 100 Posts; Posts: 54; Joined: Tue Sep 20, 2011 7:58 amFollowed by: 1 member; Thanked: 1 times

by sparkle6 » Mon Oct 03, 2011 12:56 am

What is greatest prime factor of 417 - 228?
a. 2
b. 3
c. 5
d. 7
e. 11

[spoiler]Answer: D[/spoiler]

Can someone please explain? I keep getting A.

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Source: Beat The GMAT — Problem Solving | Mon Oct 03, 2011 12:56 am

shankar.ashwin: Legendary Member; Posts: 966; Joined: Sat Jan 02, 2010 8:06 amFollowed by: 21 members; Thanked: 230 times

by shankar.ashwin » Mon Oct 03, 2011 1:00 am

417-228 = 189

189 = 3*3*3*7.

D

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