Let A be the set of all permutations a_1, a_2,\ldots.,a_6 of 1, 2, …., 6 such that a_1, a_2, \ldots. a_k is not a permutation of 1, 2, …., k for any k, 1 ≤ k ≤ 5. Then the number of elements in A is

KVPY SX SB Exam 19-Nov-2017 Question Paper

Question : 82 of 120

Marks: +1, -0

Let A be the set of all permutations

a_1, a_2,….,a_6

of 1, 2, …., 6 such that

a_1, a_2, …. a_k

is not a permutation of 1, 2, …., k for any k, 1 ≤ k ≤ 5.
Then the number of elements in A is

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