1.

How many children are there between P and Q in a row of children? I. P is fifteenth from the left in the row. II. Q is exactly in the middle and there are ten children towards his right.

Answer»

the DATA in statement I ALONE are sufficient to answer the question, while the data in statement II alone are not sufficient to answer the question,
the data in statement II alone are sufficient to answer the question, while the data in statement I alone are not sufficient to answer the question,
the data either in statement I alone or in statement II alone are sufficient to answer the question,
the data in both statements I and II TOGETHER are necessary to answer the question.

Solution :From II, Q being in the middle, there are 10 children to his right as well as to his LEFT. So, Q is `11^(th)` from the left. From I, P is `15^(th)` from the left.
Thus, from both I and II, we conclude that there are 3 children between P and Q.


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