Question

If ' $a$ ' be the sum of the odd terms and ' $b$ ' the sum of the even terms of the expansion of $(1+x{)}^n$, then ${\left(1-x^2\right)}^n=$

• A. $a^2-b^2$
• B. $a^2+b^2$
• C. $b^2-a^2$
• D. none

Answer 1

Answer: (A)

Correct answer is (a) $a^2-b^2$