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All are heads: ½ × ½ × ½ × ½ = 1/16

at least 2 are heads = not 3 are tails and not 4 are tails: 1 - 4/16 - 1/16 = 11/16

possibilities of only 3 tails: ttth ttht thtt httt

possibility of 4 tails: tttt

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Bruce Jakeway

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2y ago

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