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  • If the number of terms in the expansion of  <img alt="(x-2 y+3 z)^n" src="https://entrancecorner.oncodecogs.com/g

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

Option: 1

7


Option: 2

8


Option: 3

9


Option: 4

None of these


Answers (1)

best_answer

Given, total number of terms =\frac{(n+1)(n+2)}{2}=45 \Rightarrow(n+1)(n+2)=90 \Rightarrow n=8

Posted by

shivangi.bhatnagar

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