Question
$^nP_3 = 210$ હોય, તો $n$ ની કિંમત જણાવો.

Answer

$^nP_3 = 210$
$\therefore n(n – 1) = 210$
$\therefore n(n – 1) = 7 (7 – 1)$
$\therefore n = 7$
આમ, $n = 7$ થાય.

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