Discussion
A question is given, followed by two statements labelled I and II. Read the question and the statements, and decide whether the data provided in the statements are sufficient/necessary to answer the question.
Question:
J, K, L, M and N are standing in a row facing north. Who is in the middle of the row?
Statements:
I. J is to the immediate right of L and immediate left of M.
II. Only N is standing to the left of K.
Answer: C
Both statements together are needed. Statement I alone gives the order L, J, M left to right but does not place K and N, so the middle person cannot be fixed. Statement II alone says only N is to the left of K, so N and K are the first two on the left, but the other three are unplaced. Together, N and K occupy the left end and the group L, J, M follows, giving N, K, L, J, M, so L is in the middle. Hence the data of both statements together are necessary. Each statement alone is not sufficient, and together they are sufficient, so the last option is wrong.
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