What should come in place of question mark (?) in the following number series ?
8, 4, 4, 6, 12, ?
Multiples of 0.5 are multiplied
8 $$\times 0.5$$ = 4
4 $$\times 1$$ = 4
4 $$\times 1.5$$ = 6
6 $$\times 2$$ = 12
12 $$\times 2.5$$ = 30
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