The number of strictly increasing functions f from the set {1, 2,… | JEE Main 2026 Mathematics PYQ

MCQMediumJEE Main 2026 · 21 January, Shift 1Applications of P&C

The number of strictly increasing functions $f$ from the set $\{1, 2, 3, 4, 5, 6\}$ to the set $\{1, 2, 3, \ldots, 9\}$ such that $f(i) \ne i$ for $1 \le i \le 6$ , is equal to:

A
$22$
B
$27$
C
$21$
D
$28$

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