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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] New post 21 Mar 2008, 20:48
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A
B
C
D
E

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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] New post 21 Mar 2008, 21:32
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] New post 21 Mar 2008, 23:07
Expert's post
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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Re: PS: Bet 100-200 [#permalink] New post 22 Mar 2008, 05:56
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.
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Re: PS: Bet 100-200 [#permalink] New post 22 Mar 2008, 10:09
Expert's post
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
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Re: PS: Bet 100-200 [#permalink] New post 22 Mar 2008, 10:32
walker could u plz elaborate what is nb ne?could not get....
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Re: PS: Bet 100-200 [#permalink] New post 22 Mar 2008, 10:51
Expert's post
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, 10:51
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