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Number system

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Manager
Manager
Joined: 02 Oct 2009
Posts: 93
Followers: 1

Kudos [?]: 3 [0], given: 2

Number system [#permalink] New post 06 Nov 2009, 00:31
5). The numbers in which of the following pairs do NOT have a pair of distinct prime divisors in common ?
(A) 10 and 20
(B) 12 and 18
(C) 24 and 32
(D) 21 and 63
(E) 22 and 88


Solution..
10 and 20 have 5 and 2 common
12 and 18 have 3 and 2 common
21 and 63 have 7 and 3 common
22 and 68 have 11 and 2 common

24 is 2 * 2* *2 * 3
32 is 2*2*2*2*2

so C is the answer..
Please tell did i solve this correctly..
Manager
Manager
Joined: 04 Nov 2009
Posts: 64
Schools: London Business School (int)
WE 1: Research
WE 2: Corporate Strat
Followers: 1

Kudos [?]: 13 [0], given: 1

Re: Number system [#permalink] New post 06 Nov 2009, 00:41
Yup, that seems right.
Re: Number system   [#permalink] 06 Nov 2009, 00:41
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