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# 1<a<b<c<d, and all them can be expressed by 2^n,

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1<a<b<c<d, and all them can be expressed by 2^n, where n is a positive integer. d=?

1) a+b+c+d=170
2) abcd=2^16
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Re: PS 1<a<b<c<d [#permalink]  06 May 2006, 00:29
getzgetzu wrote:
1<a<b<c<d, and all them can be expressed by 2^n, where n is a positive integer. d=?

1) a+b+c+d=170
2) abcd=2^16

A

(1)

2^1 = 2
2^2 = 4
2^3 = 8
2^4 = 16
2^5 = 32
2^6 = 64
2^7 = 128

2 + 8 + 32 + 128 = 170

d ==> 128

(2) Many possibilities. Insufficient
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Re: PS 1<a<b<c<d   [#permalink] 06 May 2006, 00:29
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