Find the INCORRECT number in the series. 3, 6, 9, 13, 15, 18
13
The series is meant to increase by a constant step of 3 each time: 3, 6, 9, 12, 15, 18 — these are the consecutive multiples of 3.
Compare with what is given: 3, 6, 9, 13, 15, 18. The fourth term should be 9 + 3 = 12, but the series shows 13 instead.
So 13 breaks the "add 3" rule and is the incorrect number.
Hence, the incorrect number in the series is 13.
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