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