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A person with some money spends 1/3 for cloths, 1/5 of the
remaining for food and 1/4 of the remaining for travel. He
is left with Rs 100/-
How much did he have with him in the begining?
if a number is choosen between 100 and 999 includeing these
numberrs what is the provbabilty that the number selected
does not contain a 7 is