You are given a question and two statements. Identify which of the statements is/are necessary/sufficient to answer the question.
Question:
How many sons does X have?
Statements:
1. Y and Z are brothers of W.
2. The mother of Z is wife of W’s father.1
1 alone is sufficient while 2 alone is not sufficient
2
Neither 1 nor 2 alone is sufficient
3
Both 1 and 2 together are sufficient
4
2 alone is sufficient while 1 alone is not sufficient