Instructions
What should come in place of question mark (?) in the following number series?
Solution
Consecutive even numbers are multiplied and then square of natural numbers are added.
1.5 $$\times 2 + 1^2$$ = 4
4 $$\times 4 + 2^2$$ = 20
20 $$\times 6 + 3^2$$ = 129
129 $$\times 8 + 4^2$$ = 1048
1048 $$\times 10 + 5^2$$ = 10505
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