Infosys Company Numerical Ability Probability

the probability of hitting a target is 3/4 and a man tried to hit this 5 times.what is the probability of hitting a target atleast thrice?

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Infosys Other Question

In how many ways can 4 boys and 4 girls be arranged in a row such that boys and girls alternate theirpositions (that is, boy girl)? a clock is such that it looses 4 min every day.the clock is set right on feb 25,2008 2 p.m.how many min should be added to get the right time when the clock shows 9 am on 3rd march 2008?