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Which formula can be used to find the probability of four forward steps in a...

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Which formula can be used to find the probability of four forward steps in a random walk, beginning at location 0, given ten total steps and the probability of a forward step is 0.5?a) P(4)=10!/4!(6)! 0.5? (0.5)?a) P(4) = 10!/(6)! 0.5? (0.5)?c) P(4)= 10!/4! 0.5? (0.5)?d) P(4)= 5!/2!(3)! x 0.5(0.5)

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