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Instructions
What will come in place of the question mark (?) in the given number series?
Solution
Numbers of the form $$n (n+1)$$ are added, where $$n$$ is natural number
8.5 $$+ (1 \times 2)$$ = 10.5Â
10.5Â $$+ (2 \times 3)$$ =Â 16.5
16.5Â $$+ (3 \times 4)$$ =Â 28.5
28.5Â $$+ (4 \times 5)$$ =Â 48.5
48.5Â $$+ (5 \times 6)$$ =Â 78.5
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