Self Maths Puzzle Numerical Ability Sequence and Series

Find the number of zeroes in 100^1! 99^2! 98^3! *..... 1^100

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Self Other Question

Urn A contains 3 red and 2 white marbles, Urn B contains 2 red and 5 white, an Urn is selected at random, a marble is drawn and put into the other Urn, then a marble is drawn from the second Urn,, probability that both marbles drawn are of same colour is ???? A person leaves his home at a time when hour hand is between 4-5 and minute hand between 5-6, and when he returns after some time, the hands exchanged their positions. What time did he leave at?