isi-entrance 2018 Q4

isi-entrance · India · UGA Permutations & Arrangements Permutation Properties and Enumeration (Abstract)

The number of permutations $\sigma$ of $1,2,3,4$ such that $| \sigma ( i ) - i | < 2$ for every $1 \leq i \leq 4$ is
(A) 2
(B) 3
(C) 4
(D) 5.

The number of permutations $\sigma$ of $1,2,3,4$ such that $| \sigma ( i ) - i | < 2$ for every $1 \leq i \leq 4$ is\\
(A) 2\\
(B) 3\\
(C) 4\\
(D) 5.