7.Binomial Theorem
easy

If number of terms in the expansion of ${(x - 2y + 3z)^n}$ are $45$, then $n=$

A

$7$

B

$8$

C

$9$

D

None of these

Solution

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

Standard 11
Mathematics

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