31. A fair coin is tossed repeatedly. If tail appears on first four tosses, then the probability of head appearing on fifth toss equals: (A) $1 / 2$ (B) $1 / 32$ (C) $31 / 32$ (D) $1 / 5$
31. A fair coin is tossed repeatedly. If tail appears on first four tosses, then the probability of head appearing on fifth toss equals:\\
(A) $1 / 2$\\
(B) $1 / 32$\\
(C) $31 / 32$\\
(D) $1 / 5$\\