In colony, there are 55 members. Every member posts greeting card to all the members. How many greeting cards were posted by them?
Hint 1: Calculate the cards posted by a single member, which is 54.
Hint 2: Multiply this by the total number of members (55).
Hint 3: Perform the multi-digit multiplication of the total number of members by the cards sent per member to get the final count.
Step 1 (Formulate Greeting Cards logic): In a colony of 55 members, each member posts a card to all other members. Therefore, each member sends exactly cards.
Step 2 (Calculate total product): Since there are 55 members and each sends 54 cards, the total cards posted is:
Step 3 (Conclusion): The total number of greeting cards posted is exactly 2970.
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