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Which formula can be used to find the probability of one forward step in a...

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Which formula can be used to find the probability of one forward step in a random walk, beginning at location O, given two total steps and the probability of a forward step is 0.5?a) P(1) = 2!/1!(1)! 0.5(0.5)b) P(1) = 2!/2! 0.5(0.5)c) P(1) = 2!/0! 0.5(0.5)d) P(1) = 5!/2!(3)! 0.5(0.5)

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