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# PS numbers

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Intern
Joined: 04 May 2011
Posts: 16
Followers: 0

Kudos [?]: 3 [0], given: 1

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09 May 2011, 06:51
00:00

Difficulty:

(N/A)

Question Stats:

100% (01:30) correct 0% (00:00) wrong based on 9 sessions

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The value of 2^-14+2^-15+2^-16+2^-17/5 is how many times the value of 2^-17?

a)3/2
b)5/2
c)3
d)4
e)5
[Reveal] Spoiler: OA
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Joined: 16 Nov 2010
Posts: 1673
Location: United States (IN)
Concentration: Strategy, Technology
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Kudos [?]: 442 [0], given: 36

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09 May 2011, 07:31
2^-14+2^-15+2^-16+2^-17/5

= 2^-17(2*3 + 2^2 + 2 + 1)/5

= = 2^-17 * 15/5 = 3(2^-17)

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09 May 2011, 07:44
2^(-14)/5 [ 1+ 2^(-1) + 2^(-2) + 2^(-3)]

2^(-14)/5 [ 3/2 + 3/2 * 1/4]

2^(-14)/5[3/2 * 5/4]

2^(-17)*3

Hence C.
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Re: PS numbers   [#permalink] 09 May 2011, 07:44
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