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Q.

A binary sequence is an array of 0's and 1's. The number of n-digit binary sequences which contain even  number of 0s' is 

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a

2n-1-1

b

2n

c

2n-1

d

2n-1

answer is A.

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Detailed Solution

The n digit binary seqence with even no.of zeroes (i.e) 0,2,4,6,…… zeros is

nc0+nc2+nc4+……=2n-1

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