Instructions

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

Question 29

5, 4, 7, 20, 79, ?

Solution

Consecutive natural numbers are multiplies and then 1 is subtracted

5 $$\times 1 - 1$$ = 4

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

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

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

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

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