correct,
1+5 = 6 * 3 = 18
2+10=12 * 3 = 36
3 + 15= 18 * 3 = 54
therefore
4 + 20 = 24 * 3 = 72
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correct,
1+5 = 6 * 3 = 18
2+10=12 * 3 = 36
3 + 15= 18 * 3 = 54
therefore
4 + 20 = 24 * 3 = 72