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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]

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17 Jun 2007, 07:25
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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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Joined: 17 May 2007
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17 Jun 2007, 07:44

Insufficient.
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17 Jun 2007, 08:03
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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17 Jun 2007, 08:05
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
17 Jun 2007, 08:05
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