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PS1000 Sec1 Q10

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PS1000 Sec1 Q10 [#permalink] New post 11 Feb 2009, 05:45
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Is there a faster way of calculating this other than listing it by rows? Maybe a formula?

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
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Re: PS1000 Sec1 Q10 [#permalink] New post 11 Feb 2009, 05:49
A

1) the interval of numbers: 100 - 200
2) the interval of numbers with boundaries that satisfy n=3k condition: 102 - 198
3) N=(198-102)/3+1=32+1=33
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Re: PS1000 Sec1 Q10   [#permalink] 11 Feb 2009, 05:49
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