Question

the expansion (m+n)^25. what is the exponent of n in the 3rd term?

Answer 1

Binomial expansion would involve Pascal's triangle :)

Answer 2

First of all, the exponent of m in the first term is 25, and n is 0.
Then, m is 24 and n is 1.
Then m is 23 and n is 2.

they add up to 25 only.

Answer 3

So I have written the exponents for 3rd term.