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

Question

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

vay · Answer

I guess answer is E

Insufficient.

iamba · Answer

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

Fig · Answer

Agree... Same way to work it out

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

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