Question

4
O Example 15: Coefficient of x* in the expansion of
6
2
1 + 3x +
2.
X
is:
(a) 240
(c) 820
(b) 735
(d) 936​

Answer 1

Answer:

{b}

Step-by-step explanation:

(

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