Question

The coefficients of x and xin (a+bx)" are equal. If a and b are natural numbers
then the least possible value of 'a' is
1) 1
2) 3
3) 5
4) 7

Answer 1

Answer:

1 is the correct answer according to me

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

Given, E=1+(1+x)+(1+x)

2

+...(1+x)

n

=

1−(1+x)

1−(1+x)

n+1

=

x

1

[(1+x)

n+1

−1]

Hence, x

k

=

x

x

k+1

Coefficient of x

k

will be

n+1

C

k+1