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Probability of independent and dependent events

The probability of two independent events A and B is the probability of A times the probability of B.

You flip two quartes. What is the probability that you flip two heads?

Use the formula for independent events.

 p(A and B) = p(A)·p(B) p(heads and heads) = p(heads)·p(heads) = $\frac{1}{2}\;\cdot\;\frac{1}{2}$ Substitute = $\frac{1}{4}$ Multiply

The probability that you flip two heads is $\frac{1}{4}$