Exam Maths Puzzle Category

If out of a pond 60 fishes are taken out and tagged then left again in the pond and after some time 1000 fishes are taken out out of which 40 are already tagged find the total number of fishes in the pond?

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Exam Other Question

6 number are taken random an multiplied together.Then what is the probability that the product ends in a odd digit other than 5 3, 8, 6, 14, ?, 20