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Is a^4 * b^7 * c^3 * d^4 > 0 1. a^2 * b^2 * c < 0 2. b

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Is a^4 * b^7 * c^3 * d^4 > 0 1. a^2 * b^2 * c < 0 2. b [#permalink] New post 17 Jun 2007, 06:25
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A
B
C
D
E

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Is a^4 * b^7 * c^3 * d^4 > 0

1. a^2 * b^2 * c < 0
2. b * c^2 > 0
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 [#permalink] New post 17 Jun 2007, 06:44
I guess answer is E

Insufficient.
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 [#permalink] New post 17 Jun 2007, 07:03
Answer C - both together suff

1) Implies that c<0 bcos a^2 and b^2 can't be negative
2) Implies that b>0

a^4 * b^7 * c^3 * d^4 > 0 only if b and c are both positive or both negative.

Since that is not the case, we can conclude a^4 * b^7 * c^3 * d^4 is negative
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 [#permalink] New post 17 Jun 2007, 07:05
iamba wrote:
Answer C - both together suff

1) Implies that c<0 bcos a^2 and b^2 can't be negative
2) Implies that b>0

a^4 * b^7 * c^3 * d^4 > 0 only if b and c are both positive or both negative.

Since that is not the case, we can conclude a^4 * b^7 * c^3 * d^4 is negative


Agree... Same way to work it out :)
  [#permalink] 17 Jun 2007, 07:05
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