1.

Every one out of 15 telephone calls between 2.00 p.m and 4.00 p.m. in a week is busy. Find the probability that out of 6 randomly chosen telephone numbers, (i) exactly two are busy (ii) atleast three of them are busy.

Answer»


ANSWER :i) `(14^(4))/(15^(5))`ii) `(20(14)^(3)+15(147)^(2)+6(14)+1)/(15^(6))`


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