Solve the problem.A collection of dimes is arranged in a triangular array with 14 coins in the base row, 13 in the next, 12 in the next, and so forth with 1 dime in the last row. Find the value of the collection.
A. $10.50
B. $21.00
C. $5.25
D. $1.05
Answer: A
Mathematics
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A. 
B. 
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