Question

8
viii)
The middle term of the expansion of (x2 +
is
x2
a) 70
b) 80
c) 90
d) none​

Answer 1

Answer:

Answer

Correct option is

B

12

For (x

2

+

x

1

)

n

have middle term.

n is even

⇒n=2a;aEN

middle term

2a

C

a

(x

2

)

a

.

x

a

1

=

2a

C

a

.x

a

=924x

6

⇒a=6

Also for a=6,

2a

C

a

=

12

C

6

=924

So, n=2a=12

solution