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Determine the total number of the handshakes

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Twenty-eight people have been invited to a party. Each invitee meets all other invitees, shaking hands.

(a) Determine the total number of the handshakes.

(b) If five invitees are from out of state and others are local, what is the probability of randomly selecting two invitees and those two are local.

Reference no: EM131554840

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