When tossed, a certain coin has equal probability of landing on either side. If the coin is tossed 3 times, what is the probability that it will land on the same side each time?
~$\frac{1}{8}$~
~$\frac{1}{4}$~
~$\frac{1}{3}$~
~$\frac{3}{8}$~
~$\frac{1}{2}$~
都是正面是1/8,都是背面是1/8.所以3次同一面概率是1/4.
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