Please help find the probability

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Statistics
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Question description

ccording to genetic theory, the blossom color in the second generation of a certain cross of sweet peas should be red or white in a 3:1 ratio. That is, each plant has probability 3/4 of having red blossoms, and the blossom colors of separate plants are independent.(a) What is the probability that exactly 3 out of 7 of these plants have red blossoms? (b) What is the probability that exactly 5 out of 7 of these plants have white blossoms? 

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(Top Tutor) Daniel C.
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