Find the sum of n terms of each of the f...

Find the sum of n terms of each of the following
`(5^(4) -1^(4)) + (8^(4) -4^(4)) + (11^(4)-7^(4)) +`……..

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The correct Answer is:

`12n(n+1) (9n^(2) + 9n + 8)`

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