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
A
Only I and II
B
Only II and III
C
All I , II and III
D
I, II and III together are not sufficient
Correct Answer: I, II and III together are not sufficient
Here, Q, U are sons, T, R are daughters. But we can not determine P’s gender. So not sufficient formation.