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225 is the square of 15 - it equals 15 x 15

196 is the square of 14 - it equals 14 x 14

169 is the square of 13 - it equals 13 x 13.

The "how" as to the relationship between 1515 and 225 is that the "multiplied by" has been omitted.

In case the problem asks for the next in the series, 1212 is to 144 or 1616 is to 256.

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16y ago

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