Question

The coefficient of x
6
in the expansion (1 + x
2
+ x) (2 + x
2
)
6
is​

Answer 1

Answer:

(

a

1+3

+

b

2x

2

)

6

using binomial expansion

6

C

r

(1+3x)

6−r

(2x

2

)

r

Power of x will be 11 only when r=5

6

C

5

×3×2

5

=576