Question: Please help in JAVA : Write a recursive method to calculate the number of handshakes if n people each shake the hand of everyone in

Please help in JAVA :

Write a recursive method to calculate the number of handshakes if n people each shake the hand of everyone in a room. For example, if there are 2 people in the room and each shakes the others hand once, there will be 1 handshake. If there are 3 people in the room there will be a total of 3 handshakes. With 4 people there are 6 handshakes...

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