2019 June Business Mathematics and Logical reasoning and Statistics

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Question : 21 of 81

Marks: +1, -0

Which of the following is not a correct statement

$n_{P_n }= n_{p_{n–1}}$
$n_{P_n } = 2.n_{p_{n–2}}$
$n_{P_n } = 3.n_{p_{n–3}}$
$n_{P_n } = n. (n-1)_{p_{n–1}}$

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