Gujarati
6.Permutation and Combination
medium

यदि $^n{C_r} = {\,^n}{C_{r - 1}}$ और $^n{P_r}{ = ^n}{P_{r + 1}}$, तो $n$ का मान है

A

$3$

B

$4$

C

$2$

D

$5$

Solution

प्रश्नानुसार, $n – r = r – 1$ ==> $r = \frac{{n + 1}}{2}$.

अत: $n = 3$ रखने पर, $r = 2$ प्रतिबन्ध को सन्तुष्ट करता है।

Standard 11
Mathematics

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