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. Find the value of the collection.

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  1. number of dimes
    = 1+2+3+...+13+14
    = 7(1+14) = 105

    value = 105(.10) = $10.50

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