a: 2+5/6=12/6+5/6=17/6
b: 5/12+3/4+1/3=5/12+9/12+4/12=18/12=3/2
c: 2/3+3/4=8/12+9/12=17/12
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a: 2+5/6=12/6+5/6=17/6
b: 5/12+3/4+1/3=5/12+9/12+4/12=18/12=3/2
c: 2/3+3/4=8/12+9/12=17/12