Which of the following is the third term of the expansion (a + b) n ?
c(n, 2)a^(n-2) - b^2
c(n, 3)a^(n-3) - b
c(n, 2)a^2 - b^(n - 2)

The third term of the expansion is .

Step-by-step explanation:

According to the binomial expansion,

So, the rth term of this expansion is

We have to find the third term of the expansion is

Therefore the third term of the expansion is .

the answer is b.)

< 1=< 2