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please I need help solving this practice question QS.(1D) A study about people reading habit, they either read on a smart phone or a book.

please I need help solving this practice question

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QS.(1D) A study about people reading habit, they either read on a smart phone or a book. The probability that one individual reads on a smart phone is four times of the probability that one individual reads a book. 1.(5) For 20 randomly selected individuals, nd the probability that at most three read book. 2.(5) For randomly selected individuals, it they are asked one by one. Find the probability that the 6th is the first who read book

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