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GMAT prep PT1 - Integer

joyseychow: Master | Next Rank: 500 Posts; Posts: 125; Joined: Mon Dec 15, 2008 9:24 pm

by joyseychow » Tue Mar 03, 2009 6:16 am

I don't understand why answer is C and not B.

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Source: Beat The GMAT — Problem Solving | Tue Mar 03, 2009 6:16 am

kamu: Senior | Next Rank: 100 Posts; Posts: 49; Joined: Fri Feb 27, 2009 12:41 am; Thanked: 44 times; Followed by:3 members

by kamu » Tue Mar 03, 2009 6:34 am

joyseychow wrote:I don't understand why answer is C and not B.

Hi,

for n(n+1)>15 we get 4*5=20

for n(n+1<200 we get 13*14=192

Regards.

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