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There are (n + 1) white and (n + 1) black balls, each set numbered 1 to n + 1. The number of ways in which the balls can be arranged in a row so that adjacent balls are of different colours, is

A

(2n + 1)

B

2(2n)!

C

2[(n + 1)!]

D

`2[(n+1)!]^(2)`

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The correct Answer is:
D
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