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