Instructions

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

Question 159

4, 7, 20, 79, ?, 2363

Solution

The pattern is :

4 $$\times 2 - 1$$ = 7

7 $$\times 3 - 1$$ = 20

20 $$\times 4 - 1$$ = 79

79 $$\times 5 - 1$$ = 394

394 $$\times 6 - 1$$ = 2363

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