my answer is A.

we need to find if P(W)=p is > 1/2 or not

Prob of both being women = 1 - {p(of two men) + p(of 1 M , 1W)}

p = 1 - (x+y)

S1 ) Sufficient - from this we can tell if p is > 1/2 or not

because assuming 6 w 4m, 7w 3m, etc.,

we can calculate x and y and tell is p>1/2 or not

S2 ) Insufficient - coz we are given multiple values for x, but no way to know y

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Thanks, Sri

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