0
Anonymous
20
Silas Stamm ∙
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you can't
18
19. Add 3, then add 4, then add 5, then add 6,etc.
It is: 86+19+21 = 126
N - 19 = 26 step 1 (add 19 to both sides): n - 19 + 19 = 26 +19 step 2: n = 26 + 19 step 3: n = 45