Practice problem
Counting and Probability: Word Problems
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Today (June 29) is National Handshake Day!

If there's a party with individuals, of which are dogs, and the dogs can't shake each other's hands, then the number of different handshakes that can occur is . A dog CAN shake hands with a human.
Suppose there's individuals at a party, of which are dogs. How many different handshakes are possible?