Use the Pigeonhole Principle to show that if there are 31 students in a class, then at least two have first names that begin with the same letter.

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There are 26 letters in the alphabet. So by Pigeon Hole principle there are at least 2 students whose name starts with same letter.

It works for 27 students also.

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Question ID: mtid-5-stid-8-sqid-3589-qpid-2288