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Show that if there are 30 students in a class, then at least two have last names that begin with the same letter.
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Show that if there are 30 students in a class, then at least two have last names that begin with the same letter.

User Mariolpantunes
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7 votes
using Pigeonhole Principle we have ceiling (30/26) = 2.
User Milad Elyasi
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