You are given a question and two stateme...

You are given a question and two statements. Identify which of the statements is/are necessary/sufficient to answer the question.
How many daughters does Z have ?
Statements: 1. X and Y are only daughters of U
2. V is brother of X and son of Z

Either 1 or 2 alone is sufficient

1 alone is sufficient while 2 alone is not sufficient

2 alone is sufficient while 1 alone is not sufficient

Both 1 and 2 together are sufficient

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You are given a question and two statements. Identify which of the statements is/are necessary/sufficient to answer the question.
How many daughters does Z have ?
Statements: 1. X and Y are only daughters of U
2. V is brother of X and son of Z