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In T.Nagar the buildings were numbered from 1 to 100.Then how many 0’s will be present in the numbers?

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TCS Other Question

A grand father has 3 grand children. Age difference of two children among them is 3. Eldest child age is 3 times the youngest child’s age and the eldest child age is two year more than the sum of age of other two children. What is the age of the eldest child? 1! + 2! + 3! + ………………………+ 2730! = ?