Instructions

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

Question 59

121 197 311 463 653 (?)

Solution

Multiples of 38 are added:

121 + $$38 \times 2$$ = 197

197 + $$38 \times 3$$ = 311

311 + $$38 \times 4$$ = 463

463 + $$38 \times 5$$ = 653

653 + $$38 \times 6$$ = 881

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