Q 1668623505.     What is ` sum_(r = 0)^1 text()^(n+r)C_n`, equal to?

NDA 2015 Paper 1 April
A

`text()^(n+2)C_1`

B

`text()^(n+2)C_n`

C

`text()^(n+3)C_n`

D

`text()^(n+2)C_(n+1)`

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