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Find the sum 2^2 + 4^2 + 6^2 + 8^2 …… u...

Find the sum `2^2 + 4^2 + 6^2 + 8^2` …… upto to n terms.

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The correct Answer is:
`( 2n ( n+1) ( 2 n +1) )/(3) `
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