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

1 thought on “Which are the triangle number in the give list ?<br /> 3,6,8,9,12,15,16,20,21,42”

1. 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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