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6, 9, 15, 21, 24, 28, 30

/ Aptitude, Odd Man Out And Series / By
Question:
6, 9, 15, 21, 24, 28, 30

[A].

28

[B].

21

[C].

24

[D].

30

Answer: Option A

Explanation:

Each of the numbers except 28, is a multiple of 3.