Answer:
15 & 21
Explanation:
1, 1 + 2 = 3, 3 + 3 = 6, 6 + 4 = 10, 10 + 5 = 15, 15 + 6 = 21
15,21
0, 1, 3, 6, 10, ___, ___
+1 +2 +3 +4
Next would come +5
10+5 = 15
Next would come +6
15+6 = 21
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