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in Algebra by (48.0k points)
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The value of \(\sum\limits_{r = 1}^n \frac{^nP_r}{r!}\) is

(a) 2n

(b) 2n – 1

(c) 2n–1

(d) 2n + 1

1 Answer

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Best answer

Correct option is (b) 2n - 1

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