Question

$n:r$

• A. $x:n$
• B. $(1 + x)^{2n}$
• C. $(1 + x)^{2n - 1}$
• D. None of these

Answer 1

Answer: (A)

$x:n$

Answer 2

We know that

$(1 + x)^{n} = C_{0} + C_{1}x + C_{2}x^{2} + .......... + C_{n}x^{2},$

So, $C_{0}^{2} + C_{1}^{2} + C_{2}^{2} + C_{3}^{2} + ...... + C_{n}^{2}$