Answer :

1, 3, 6, 6, 10 , 15, 21, 28 the rule is to add 1 then 2 then 3 and on
1 + 2 = 3 + 3 = 6 + 4 = 10 + 5 = 15 + 6 = 21 + 7 = 28 :)

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