In a class, each of the students were asked to pick an integer between 1 and 20, both inclusive. What is the probability that at least two students have picked up the same integer?
(1) There were less than 30 students.
(2) There were 30 students.
It's quite evident as to why
is the answer here.
My question though is that is there anyway that we can solve this question?
I agree that it's a DS question but I couldn't help but wonder if there was a mathematical solution for this.
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