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A fair coin is tossed 100 times. The probability that on the tenth throw the fourth six appears is

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A rifleman is firing at a distant target and has only 10% chance o hitting it. The least number of rounds, he must fire in order to have more than 50% chance of hitting it at least once is

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A fair coin is tossed a fixed number of times. If the probability of getting seven heads is equal to that of getting nine heads, the probability of getting two heads is

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A fair die is thrown twenty times. The probability that on the tenth throw the fourth six appears is

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If X is a binomial variate with parameters n and p, where 0 < p < 1 such that is independent of n and r, then p equals.