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JAMB Mathematics 2019 Paper

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Question : 11

Total: 73

If a fair coin is tossed 3 times, what is the probability of getting at least two heads?

$\frac{2}{3}$
$\frac{4}{5}$
$\frac{2}{5}$
$\frac{1}{2}$

Solution:

The outcomes are {HHH, HHT, HTT, HTH, THH, THT, TTH, TTT}

P(at least two heads) = $\frac{4}{8}$

= $\frac{1}{2}$

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