If a class has 23 students in it then the probability that at least two of the students share a birthday is about 0.5. Surprised? If there are 50 students in a class then it's virtually certain that two will share the same birthday. This seems to go against common sense but is absolutely correct.
Teacher: What is 2k + k?
Q: Why do you rarely find mathematicians spending time at the beach?
A: Because they have sine and cosine to get a tan and don't need the sun!
Q: What does the zero say to the the eight?
A: Nice belt!
Q: What does a mathematician present to his fiancée when he wants to propose?
A: A polynomial ring!
Q: What does the little mermaid wear?
A: An algae-bra.
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