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