Instructions
What will come in place of the question mark (?) in the following number series?
Solution
Numbers are multiplied by successive natural numbers and then 7 is added
2 $$\times 1 + 7$$ = 9
9 $$\times 2 + 7$$ = 25
25 $$\times 3 + 7$$ = 82
82 $$\times 4 + 7$$ = 335
335 $$\times 5 + 7$$ = 1682
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