Handshake Day\text{Handshake Day}

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Today (June 29) is National Handshake Day!

Woman and dog shaking hands.

If there's a party with 1010 individuals, 22 of which are dogs, and the dogs can't shake each other's hands, then the number of different handshakes that can occur is 4444. A dog CAN shake hands with a human.

Suppose there's 4242 individuals at a party, 22 of which are dogs. How many different handshakes are possible?

Choose one answer

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