Asked by Ellie

Determine the seating capacity of an auditorium with 10 rows of seats if there are 10 seats in the first row, 16 seats in the second row, 22 seats in the third row, 28 seats in the forth row, and so on

???
Answered by bobpursley
looks like an arithemetic progression, is 10, then each row increases by 6

Isn't there a neat formula for that?
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