Question
Seven persons, L, M, N, O, P, Q and R goes for vacation
in seven different months among January, February, March, April, May, June and July of the same year. How many persons goes before Q? Statement I: Only two persons goes after L. M goes two months before L. N goes immediately after P. O does not go in the month, which has only 30 days. R goes two months before Q. Statement II: P goes two months before M. R goes immediately after M. O goes three months after R. L and Q goes one after the other. The question given below consists of two statements I and II given below it. You have to decide whether the data provided in the statements are sufficient to answer the question. Read all the statements and give answer.Solution
From statement I, There will be two cases from statement I. 
From statement II, 
From statement I and II, we have 
So, five persons goes before Q. Hence data in statement I and II together are necessary to answer the question.
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