0, 4, 6, 3, 7, 9, 6, ?, 12, 9, 13, 15
Explanation:
It is a combination of 3 series.
1st series: 0, 3, 6, ...
2nd series: 4, 7, 10, ...
3rd series: 6, 9, 12, ...
In the 2nd series, each term is increased by 3 to obtain the next term.
So, the missing term is 7 + 3 = 10
Hence, option (b).
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