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Please help! Thanks! A fair coin is tossed 25 times. What is the probability that at least 3 tails occur?

Please help! Thanks!

A fair coin is tossed 25 times. What is the probability that at least 3 tails occur?

a) 0.000068545

b) 0.999921739

c) 0.999990284

d) 0.000000030

e) 0.999990314

f) None of the above.

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