what is the next number in series 12,15,21,24,30,39....
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42,48,51,54,60,69 may be don't know
as i am not expert in math
as i am not expert in math
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0
42,48,57. Because the first digit have 2 no. gap and then second no. have 5 no. gap and then at last it have 8 no. gap
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