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Find 12^2 + 13^2 + 14^2 + 15^2 + ………….. ...

Find `12^2 + 13^2 + 14^2 + 15^2 + ………….. + 20^2`

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The correct Answer is:
14184
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Find n if. ((15 - n)!) / ((13 - n)!) = 12

Find the value: |15-2|