Six distinct students are to stand in a queue

MATHEMATICS · Single correct · CBSE · Mathematics · Permutations and Combinations · Permutations and Combinations

Problem

Six distinct students are to stand in a queue. Let N1N_1 be the number of possible queues in which student A is at the extreme left end, and N2N_2 be the total number of possible queues without any restriction. Find the ratio N1:N2N_1 : N_2. (a) 1:31:3 (b) 5:65:6 (c) 1:61:6 (d) 1:51:5

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