7.Binomial Theorem
easy

यदि ${(x - 2y + 3z)^n}$ के विस्तार में $45$ पद हैं, तब $n=$

A

$7$

B

$8$

C

$9$

D

इनमें से कोई नहीं

Solution

$\frac{{(n + 1)(n + 2)}}{2} = 45$ या ${n^2} + 3n – 88 = 0 \Rightarrow n = 8$.

Standard 11
Mathematics

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