28*27/2 = 378
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3. AB, BC and CA.
Ah, what a lovely thought! When each person shakes hands with every other person at the party, it creates a beautiful connection. In this case, with 3 people at the party, there will be 3 handshakes in total. Just imagine the joy and warmth shared in those simple gestures!
[''] [''] [''] [''] 1 2 3 4 if person number 1 has to give a gift to person 2, 3 and 4 (hint), he/she has to buy three presents. If there are 4 people and they each have to do this, the sum you would need to use is 4 x 3. The answer to that would be 12. There would be 12 gifts at the party.
If there are seven people, then the number of handshakes is 7*6/2 = 21