Today not a very difficult riddle. I think it's just a bit of math ;)
You are invited to a party with 20 people. Everyone says hello to everyone. How many greetings will be?
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From @deusericius
Today not a very difficult riddle. I think it's just a bit of math ;)
You are invited to a party with 20 people. Everyone says hello to everyone. How many greetings will be?