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A man takes a step forward with probability 0.4 and backwards with probability 0.6 .find the probability that at the end of eleven steps he is just one step away from the starting point
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6 forward 5 backward or 6 backward 5 forward

 11C6 * (0.4)^6 * (0.5)^5 + 11C6 * (0.4)^5 * (0.6)^5

 11C5 * (0.4)^5 * (0.6)^5 * (0.4 + 0.6)

= 0.368 is the answer

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