CAT Exam Numerical Ability Permutation and Combination

find da maximum value of n such that 570*60*30*90*100*500*700*343*720*81 is perfectly divisible by 30^n answer

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CAT Other Question

a bag contains marbles of seven different colors what is the least number of marbles that a blind man must draw so that he has five marbles of same colour? find the number of consecutive zero at the end of 1!*2!*3!*4!*5!*-------*50!