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# What is the total number of integers between 100 and 200

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What is the total number of integers between 100 and 200 [#permalink]  21 Mar 2008, 21:48
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What is the total number of integers between 100 and 200 that are divisible by 3?
(A) 33
(B) 32
(C) 31
(D) 30
(E) 29

What is the easiest way to solve such problems
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Re: PS: Bet 100-200 [#permalink]  21 Mar 2008, 22:32
should be A-33.

Just do 100/3. for every three numbers there is a 3 multiple.
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Re: PS: Bet 100-200 [#permalink]  22 Mar 2008, 00:07
sreehari wrote:
should be A-33.

Just do 100/3. for every three numbers there is a 3 multiple.

What do you say about the total number of integers between 99 and 199 that are divisible by 3?
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PROMO: Are you an exiting GMAT ToolKit (iOS) user? Get GMAT ToolKit 2 (iOS) for only $0.99 (read more) Math: GMAT Math Book ||| General: GMATTimer ||| Chicago Booth: Slide Presentation The People Who Are Crazy Enough to Think They Can Change the World, Are the Ones Who Do. Senior Manager Joined: 15 Aug 2007 Posts: 257 Schools: Chicago Booth Followers: 1 Kudos [?]: 36 [0], given: 0 Re: PS: Bet 100-200 [#permalink] 22 Mar 2008, 06:56 walker wrote: sreehari wrote: should be A-33. Just do 100/3. for every three numbers there is a 3 multiple. What do you say about the total number of integers between 99 and 199 that are divisible by 3? Including the boundaries? Obviously need to consider two things in such situations - boundaries, and rounding. CEO Joined: 17 Nov 2007 Posts: 3596 Concentration: Entrepreneurship, Other Schools: Chicago (Booth) - Class of 2011 GMAT 1: 750 Q50 V40 Followers: 232 Kudos [?]: 1301 [0], given: 346 Re: PS: Bet 100-200 [#permalink] 22 Mar 2008, 11:09 Yes, it is a GMAT trap. I use always a formula: N=\frac{Ne-Nb}{d}+1 100..200: N=\frac{198-102}{3}+1=33 99..199: N=\frac{198-99}{3}+1=34 _________________ iOS/Android: GMAT ToolKit - The bestselling GMAT prep app | GMAT Club (free) | PrepGame | GRE ToolKit | LSAT ToolKit PROMO: Are you an exiting GMAT ToolKit (iOS) user? Get GMAT ToolKit 2 (iOS) for only$0.99 (read more)
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Re: PS: Bet 100-200 [#permalink]  22 Mar 2008, 11:32
walker could u plz elaborate what is nb ne?could not get....
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Re: PS: Bet 100-200 [#permalink]  22 Mar 2008, 11:51
suyashjhawar wrote:
walker could u plz elaborate what is nb ne?could not get....

see here: 7-t61502
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Re: PS: Bet 100-200   [#permalink] 22 Mar 2008, 11:51
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# What is the total number of integers between 100 and 200

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