MathRevolution wrote:

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Math Revolution GMAT math practice question]

If a certain coin is flipped, it has probability \(\frac{1}{2}\) of landing on heads and probability \(\frac{1}{2}\) of landing on tails. If the coin is flipped \(4\) times, what is the probability that it will land on tails at least once?

\(A. \frac{3}{8}\)

\(B. \frac{1}{4}\)

\(C. \frac{1}{2}\)

\(D. \frac{5}{16}\)

\(E. \frac{15}{16}\)

P ( of only heads) = 1/2

and 4 times would be (1/2)^4 = 1/16

P of at least one tails 1-1/16 = 15/16 IMO E

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