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probability

a fair coin is flipped four times. What is the probability of getting tails at least twice?

Flipping 4 times the probability of

getting 0 tails: $(\frac{1}{2})^4=\frac{1}{16}$
getting 1 tail: $4(\frac{1}{2})^4=\frac{1}{4}$

Thus the probability of getting at least 2 tails is $1-\frac{1}{16}-\frac{1}{4}$ .

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