MBA Exam

At the beginning of a class, it is required that every student find a tag with his or her name on it. Now assume that each student picks up tag arbitrarily.What is the probability that at least one student chooses the tag belonging to him or her?? Assume number of student to be 20. Pls post the approach. No OA available.

1) I know how to solve this question
2) I am just skipping it.

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MBA Other Question

what is the remainder when 792379237923.......upto 400 digits is divided by 101?

1) 99
2) 56
3) 45
4) 3
What is the reminder when 12345678987654321 divided by 1001

1) 10
2) 309
3) 692
4) 995