Gujarati
6.Permutation and Combination
easy

यदि $2 \times {}^n{C_5} = 9\,\, \times \,\,{}^{n - 2}{C_5}$ हो, तो $n$ का मान होगा

A

$7$

B

$10$

C

$9$

D

$5$

Solution

निरीक्षण से, $n = 10$.

Standard 11
Mathematics

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