Discussion
How many sons does X have ?
Statements:
1. Q and U are brothers of T.
2. R is sister of P and U.
3. R and T are daughters of X.
Answer: D
Correct answer: 1, 2 and 3 together are not sufficient
The three statements together establish that R and T are X’s daughters and that Q, U and P are siblings of theirs - but the sex of P is never given, and nothing rules out further children not mentioned at all. The number of sons is therefore two or three, and cannot be settled even with all three statements.
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