Instructions

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

Question 1

6, 11, 31, 121, 601, ?

Solution

The pattern here followed is :

6 $$\times 2 - 1$$ = 11

11 $$\times 3 - 2$$ = 31

31 $$\times 4 - 3$$ = 121

121 $$\times 5 - 4$$ = 601

601 $$\times 6 - 5$$ = 3601

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