Community mocks

Zach · Q11

Probability

There are 129 coins on a table. 128 are fair, and one has heads on both sides. A coin is tossed 8 times and lands on heads every time. What is the probability it lands on heads if thrown a 9th time?

A12\frac12
B910\frac9{10}
C78\frac78
D56\frac56
E23\frac23

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