numbes between

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brick2009: Master | Next Rank: 500 Posts; Posts: 171; Joined: Mon Jun 01, 2009 8:59 pm; Thanked: 8 times

by brick2009 » Fri Dec 04, 2009 12:31 pm

How many integers are there between, but not including, integers a and b ?

(1) b - a = 8

(2) There are 7 integers between, but not including, a - 1 and b - 1.

OA: d

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Source: Beat The GMAT — Data Sufficiency | Fri Dec 04, 2009 12:31 pm

heshamelaziry: Legendary Member; Posts: 869; Joined: Wed Aug 26, 2009 3:49 pmFollowed by: 3 members; Location: California; Thanked: 13 times

by heshamelaziry » Fri Dec 04, 2009 3:22 pm

brick2009 wrote:How many integers are there between, but not including, integers a and b ?

(1) b - a = 8

(2) There are 7 integers between, but not including, a - 1 and b - 1.

OA: d

This is an easy one. It has to be D.

1) B-a = 8 so think 8-6=2 including 8 so between b and a there are 7 integers not including b and a.

2) a-1 and b-1 have no effect on the question. statement 2 explicitly says there are 7 integers betweeen a and b

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