1.

A man takes a step forward with probability 0.3 and backwards with probability 0.7. Then the probability that at the end of 15th step, he is one step away from the starting point is 15Ca×ba. The value of a+100b is

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A man takes a step forward with probability 0.3 and backwards with probability 0.7. Then the probability that at the end of 15th step, he is one step away from the starting point is 15Ca×ba. The value of a+100b is



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