First it adds by 3. Then on 4, 8, 12 it adds by 4. On 5 and 10 it adds by 5. So i guess it is 3, 4, 5.
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3/4 of 12 = 12*3/4 = 9
2/3 + 3/4 = (2×4)/(3×4) + (3×3)/(4×3) = 8/12 + 9/12 = (8+9)/12 = 17/12 = (1×12+5)/12 = 1 5/12.
1/3 - 1/4 = (1×4)/(3×4) - (1×3)/(4×3) = 4/12 - 3/12 = (4-3)/12 = 1/12
9/12 = (3×3)/(4×3) = 3/4
3/4 + 2/3 = (3*3)/(4*3) + (2*4)/(3*4) = 9/12 + 8/12 = 17/12 or 1 and 5/12