Traditional Culture Encyclopedia - The 24 Solar Terms - There are five children. If they send postcards to each other, how many will they send?
There are five children. If they send postcards to each other, how many will they send?
There are five children. If they send postcards to each other, they must send 20 postcards. Because a * * * has five children, and each child has to send postcards to the other four people, then a * * * has to send 5×4=20 postcards. So there are five children. If they send postcards to each other, they must send 20 postcards.
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