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The number of terms in the expansion of (x + y + z)n_________________
Answers (1)
We know that,
(x+y+z)n = [x+(y+z)]n
= nC0xn + nC1xn-1 (y+z) + nC2xn-2 (y+z)2 + …… + nCn (y + z)n
Therefore, the no. of terms in the expansion will be –
1+2+3+ …. +n+(n+1)
= (n+1)(n+2)/2
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