Question

If the squares of a `8 xx 8` chess board are painted either red and black at random .The probability that not all squares is any alternating in colour is
A. `1//2^(64)`
B. `1//2^(63)`
C. `1//2`
D. none of these

Answer 1

Correct Answer - B
This is possible only when the column are alternating red and black. Hence, the required probability is `2//2^(64) = 1//2^(63)`.