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Consider the expansion of (1+x)^n. Let p...

Consider the expansion of `(1+x)^n`. Let p, q, r and s be the coefficients of first, second, nth and `(n + 1)th` terms respectively. What is `(ps + qr)` equal to?

A

`1+2n `

B

`1+2n^2`

C

`1 + n^2`

D

`1 + 4n`

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