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Identify the number that does NOT belong to the following series.
20, 10, 10, 15, 30, 90
$$20\times0.5\ =\ 10$$
$$10\times1\ =\ 10$$
$$10\times1.5\ =\ 15$$
$$15\times2\ =30$$
$$30\times2.5\ =75$$
As per the above-given logic, here 90 does not belong to the given series.
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