There are n white and n black balls marked 1 , 2 , 3 , … . n . The number of ways in which we can arrange these balls in a row so that neighbouring balls are of different colours is

Question

There are n white and n black balls marked 1 , 2 , 3 , … . n . The number of ways in which we can arrange these balls in a row so that neighbouring balls are of different colours is, ( n ! ) 2, (2n)!, 2 ( n ! ) 2, ( n ! ) 2 ( 2 n )! ​

MARKS App · Accepted Answer

BW BW ..... = n ! × n ! or WB WB ..... = 2 ( n ! ) 2

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