A man takes a step forward with probability 0.4 and one step backward with probability 0.6 , then the probability that at the end of eleven steps he is one step away from the starting point, is
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: Since, the man is one step away from starting point means that either
(i) man has taken 6 steps forward and 5 steps backward
or
(ii) man has taken 5 steps forward and 6 steps backward.
Taking, movement 1 step forward as success and 1 step backward as failure
probability of success 
probability of failure 
Required probability 
or 
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