self Maths Puzzle Probability

Q. A bag contains 3 types of apples. How many apples should be picked from the bag so that at least three of them are of the same kind

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self Other Question

Q. How many words can b formed by Pankaj and at which number it (Pankaj) will come as per dectonery rule. Q. Find the no of zeroes in:
100^1 *99^2 *98^3 *97^4* ........ *1^100. plz explain your ans.....