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# PS-How many Positive integers?

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Director
Joined: 04 Jan 2008
Posts: 893

Kudos [?]: 785 [0], given: 17

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28 Mar 2009, 22:09
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This topic is locked. If you want to discuss this question please re-post it in the respective forum.

How many positive integers, from 2 to 100, inclusive, are not divisible by odd integers greater than 1?

A. 5
B. 6
C. 8
D. 10
E. 50

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Kudos [?]: 785 [0], given: 17

Director
Joined: 04 Jan 2008
Posts: 893

Kudos [?]: 785 [0], given: 17

Re: PS-How many Positive integers? [#permalink]

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29 Mar 2009, 02:13
How to approach?
I have the OE but i need some quick soln
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Kudos [?]: 785 [0], given: 17

Manager
Joined: 19 May 2008
Posts: 162

Kudos [?]: 13 [0], given: 0

Location: Mumbai
Re: PS-How many Positive integers? [#permalink]

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29 Mar 2009, 02:19
I think this should be simple - 2, 4, 8, 16, 32 and 64.

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Senior Manager
Joined: 28 Aug 2006
Posts: 303

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Re: PS-How many Positive integers? [#permalink]

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29 Mar 2009, 05:17
nitya34 wrote:
How many positive integers, from 2 to 100, inclusive, are not divisible by odd integers greater than 1?

A. 5
B. 6
C. 8
D. 10
E. 50

The question clearly says that we need to find numbers which do not have odd factors.

So the number must be of the form $$2^n$$

Hence the numbers in the given range are $$2, 2^2, 2^3, 2^4, 2^5 \quad and \quad 2^6$$

So totally 6 numbers exits.
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Director
Joined: 04 Jan 2008
Posts: 893

Kudos [?]: 785 [0], given: 17

Re: PS-How many Positive integers? [#permalink]

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29 Mar 2009, 08:12
Thanks
It looks simple now
OA-B
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Kudos [?]: 785 [0], given: 17

Manager
Joined: 19 Aug 2006
Posts: 238

Kudos [?]: 14 [0], given: 0

Re: PS-How many Positive integers? [#permalink]

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29 Mar 2009, 10:20
We have a range of 2...100.

Only some of the even integers will not be divisible by odd numbers in this range.
Let's try to list a few even numbers in the range: 2,4,6,8,10,12,14,16,18,20....
Out of these 2,4,8,16 are not divisible by odd factors - it can be deduced that the numbers we seek are multiples of 2: 2,4,8,16,32,64.

Kudos [?]: 14 [0], given: 0

Re: PS-How many Positive integers?   [#permalink] 29 Mar 2009, 10:20
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