exam Maths Puzzle Numerical Ability

If three coins are tossed what is the probability of tossing two heads and one tail?

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Prob = 3c2/2^3 = 3/8
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exam Other Question

how do you solve these kinds of problems 1.) k+1/2 < k/4+2 When solved the inequality k was = to 0, so the variable was 0!