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並前往https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:prob-comb/x9e81a4f98389efdf:combinations/v/handshaking-combinations

Handshaking combinations (video) | Khan Academy

Also, you can think the handshake question like this: Take 5 people for example. Then A will shake hand with B, C, D, E. B will shake hand with C, ...

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