Which are the triangle number in the give list ? 3,6,8,9,12,15,16,20,21,42

Answer:

3,3,9,12,15,21,42

Step-by-step explanation:

I think the have 3 parts like 3,6

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Answer:3,3,9,12,15,21,42

Step-by-step explanation:I think the have 3 parts like 3,6