Solve the problem.
-A collection of dimes is arranged in a triangular array with 11 coins in the base row, 10 in the next, 9 in the next, and so forth. Find the value of the collection.
A)$ 0.66
B)$ 13.20
C)$ 3.30
D)$ 6.60

Question

Quizplus · Accepted Answer

The total number of dimes is the sum of the first 11 natural numbers, which is calculated using the formula n(n + 1)/2, where n = 11. So, the total number of dimes = 11(11 + 1)/2 = 66. Since each dime is worth $0.10, the total value of the collection is 66 * $0.10 = $6.60.

Solve the Problem. -A Collection of Dimes Is Arranged in a Triangular Array