Instructions

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

Question 155

319, 320, 347, 472, 815, ?

Solution

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Cubes of consecutive odd natural numbers are added

319 + $$1^3$$ = 320

320 + $$3^3$$ = 347

347 + $$5^3$$ = 472

472 + $$7^3$$ = 815

815 + $$9^3$$ = 1544

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