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A basket contains 3 green and 4 red marbles. If three marbles picked at random,what is the probability that all three are of same colour?

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If numerator of a fraction is increased by 500% and denominator is increased by 600% then resultant fraction becomes 18/35 then find out original fraction ? A,B,C are pipes attached to a cistren.A na d B can fill it in 20 and 30 ..while C empty it in 15 min..If A,B,C open successively for 1 min each.how soon the cistern will be filled?