Question 754449
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?
1+2+3+...+13+14+15
= (15/2)(1+15) = 15*8 = 120
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cheers,
Stan H.
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A.180
B.30
C.120
D.15