Question

In the expansion of$x^{n}$, the constant term is.

• A. – 20
• B. 20
• C. 30
• D. – 30

Answer 1

Answer: (A)

– 20

Answer 2

In the expansion of $x + y$, the general term is $7^{2n} + 2^{3n - 3}.3^{n - 1}$

For term independent of

$7^{2 \times 1} + 2^{3 \times 1 - 3}.3^{1 - 1}$

Thus the required coefficient

$7^{2} + 2^{0}.3^{0} = 49 + 1 = 50$.