Here's how I solved this.

STEM:Is \(X^2Y^3Z^2 \gt 0\)

Since \(X^2\) and \(Z^2\) will ALWAYS be positive irrespective of their value, the stem can be Paraphrased as is - \(Y^3 \gt 0\). In plan english, What is the sign of Y?

S1:\(XY \gt 0\)

Possible when both X&Y are positive or Both X&Y are negative. Meaning X can be either +ve or Negative. Insuff

S2: \(YZ \lt 0\)

Same reasoning as S1. X could be +ve or -ve. Insuff

S1+S2:Combining Both statements we get \(XY \gt YX\) => \(Y(X-Z) \gt 0\). This is still not enough to tell us tell us the exact sign of Y and Insuff

S1 Insuff. S2 Insuff. S1+S2 insuff. Final answer is

E
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