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  4. Let i=√-1. If ((-1+i √3)21/(1-i)24)+((1+i √3)21/(1+i)24)=k, and n=[|k|] be the greatest integral part of |k|. Then ∑j=0n+5(j+5)2-∑j=0n+5(j+5) is equal to.

Q. Let . If , and be the greatest integral part of . Then is equal to.

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