Three unbiased coins are tossed once

MATHEMATICS · Single correct · A Level · Mathematics · Probability · Probability

Problem

Three unbiased coins are tossed once. Find the probability of getting at least two tails. (a)

\dfrac{5}{8}

(b)

\dfrac{1}{2}

(c)

\dfrac{3}{8}

(d)

\dfrac{1}{4}