Question

please solve it I have my test tomorrow​

Answer 1

fin what is n and substitute according to question

Answer 2

Answer:

Correct option is

C

n.2

n−1

Solution -

(1+x)

x

=C

0

+C

1

x+C

2

x

2

+−−−C

n

x

n

Differentiate both sides w.r.t.x.

n(1+x)

n−1

=C

1

+2C

2

x+−−−−

n

C

n

x

n−1

Put x=1

n2

n−1

=C

1

+

2

C

2

+−−−−−−

n

C

n

C is correct