SOLUTION: A grocery clerk sets up a display of 12-pack cartons of cola. There are 15 cartons at the base of the triangle and one at the top. How many cartons of cola are needed for the compl

Question 754350: A grocery clerk sets up a display of 12-pack cartons of cola. There are 15 cartons at the base of the triangle and one at the top. How many cartons of cola are needed for the complete display?
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
Best guess is the sequence subtracts 1 going upward starting from 15 cartons on the bottom. You are looking at the sum of the first 15 natural numbers. Arithmetic Series.

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