1. xy > 0
if both x & y are negative then ans is greater than zero
if both x & y are positive then also the ans is greater than zero
INSUFF
2. Same as 1 INSUFF
both together INSUFF.
Ans E
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Source: Beat The GMAT — Data Sufficiency |
ans should be C
both X&Y have the same sign, and X&Z have the same sign. If X is negative even Y and Z are negative. If all 3 are negative then XYZ<0>0
so all three have to be positive
both X&Y have the same sign, and X&Z have the same sign. If X is negative even Y and Z are negative. If all 3 are negative then XYZ<0>0
so all three have to be positive
