In a colony, there are 55 members. Every member posts a greeting card to all the members. How many greeting cards were posted by them?
Question
Solution 1
To solve this problem, you need to understand that each member of the colony is sending a greeting card to every other member. This means that each person is sending 54 cards (55 members minus themselves).
Step 1: Determine the number of cards each person is sending. In this case, it's 54 (55-1).
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