Instructions

What should come in place of question mark (?) in the following number series?

Question 128

6 349 565 ? 754 781

Solution

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Cubes of natural numbers are added.

6 $$+ 7^3$$ = 349

349 $$+ 6^3$$ = 565

565 $$+ 5^3$$ = 690

690 $$+ 4^3$$ = 754

754 $$+ 3^3$$ = 781

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