If a coin has an equal probability of landing heads up or tails up each time it is flipped, what is the probability that the coin will land heads up exactly twice in 3 consecutive flips?
0.125
0.25
0.375
0.50
0.666
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C21*C21*C21（乘法原则）再乘C32=3/8
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C21*C21*C21（乘法原则）再乘C32=3/8
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