In the following number series only one number is wrong. Find out the wrong number.
4, 3, 4.5, 8.5, 20, 53, 162.5
The pattern is :
4 $$\times 0.5 + 1$$ = 3
3 $$\times 1 + 1.5$$ = 4.5
4.5 $$\times 1.5 + 2$$ = 8.75 $$\neq 8.5$$
8.75 $$\times 2 + 2.5$$ = 20
20 $$\times 2.5 + 3$$ = 53
53 $$\times 3 + 3.5$$ = 162.5
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