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Odd Man Out and Series - General Aptitude

Find out the wrong number in the given sequence of numbers.
Q1:

36, 54, 18, 27, 9, 18.5, 4.5

A 4.5

B 18.5

C 54

D 18

ANS:B - 18.5

The terms are alternatively multiplied by 1.5 and divided by 3. However, 18.5 does not satisfy it.