Every day, the number of lunchtime customers in a restaurant increased. On the 1st day..

Gail

New member
...there were 3 customers? ; on the 2nd day there were 12; and on the third day, 27. At this rate, how many customers will there be on the 8th day? Find a formula that would tell how many customers, C, there are if it is the nth day.
 
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