Question
Eric swam for 3 days. On each day, he would do 4 more laps than the previous day. He did n number of laps on the first day. What was the total number of laps he did for the 3 days? Give your answer in terms of n.
2 m

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Eric swam for 3 days. On each day, he would do 4 more laps than the previous day. He did n number of laps on the first day. What was the total number of laps he did for the 3 days? Give your answer in terms of n.