Question

The number of terms in the expansion of $(a+b+c{)}^n$

will be

• A.
• B.
• C.
• D. None of these

Answer 1

The correct option is C

By converse rule, put n= 1, 2, then number of terms are 3, 6.

Hence number of terms of $(a+b+c{)}^n$

= $\frac{(n+1)(n+2)}{2}$.