Riddle:
If seven people meet each other and each shakes hands only once with each of the others, how many handshakes will there have been?
Show Hint
Hint:
Most people will think it's 42, but remember, the first person
shakes the hand of 6 people. The SECOND person
shakes the hand of 5 people, and on and on until the sixth person only
shakes one hand. Use this to figure out the answer!