Question

If the number of terms in the expansion of $(x+y+z{)}^n$ are $36$, then the value of $n$ is

• A. 6
• B. 7
• C. 8
• D. 9

Answer 1

Answer: (B)

Number of terms in the expansion of $(x+y+z{)}^n$ is $(n+1)(n+2)/2=36$
or $(n+1)(n+2)=72$
or $n=7$