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A man takes a step forward with probabil...

A man takes a step forward with probability 0.4 and back ward with probability 0.6. The probability that at the end of eleven steps he is one step away from the starting point is:

A

`3696/7^4`

B

`3969/4^7`

C

`4^4/10`

D

none of these

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The correct Answer is:
B
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