(a) If a fair die is rolled 22 times, what is the probability that a 6 is...

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(a) If a fair die is rolled 22 times, what is the probability that a 6 is obtained exactly 3 times?
(b) If a fair die is rolled, what is the probability that the third time that a 6 is obtained is on the tenth roll?
(c) If a fair coin is tossed 11 times, what is the probability that three or fewer heads are obtained?
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