How many sons does X have ? I. Q and U are brothers of T. II. R is sister of P and U. III. R and T are daughters of X.

How many sons does X have ? I. Q and U are brothers of T. II. R is sister of P and U. III. R and T are daughters of X. Correct Answer I, II and III together are not sufficient

The information given in the three statements together is also not sufficient to answer the given question. 

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Question : How many sons does X have ?

Statements :
I. Q and U are brothers of T.
II. R is sister of P and U.
III. R and T are daughters of X.
How many sons does X have ? I. Q and U are brothers of T. II. R is sister of P and U. III. Rand Tare daughters of X
How many sons does X have? 1. Q and U are brothers of T. 2. R is sister of P and U. 3. R and T are daughters of X.