Instructions

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

Question 121

12 22 69 272 1365 ?

Solution

The pattern followed is :

12 $$\times 2 - 2$$ = 22

22 $$\times 3 + 3$$ = 69

69 $$\times 4 - 4$$ = 272

272 $$\times 5 + 5$$ = 1365

1365 $$\times 6 - 6$$ = 8184

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