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If I=3/4-:5/6,\ \ I I=3-:[(4-:5)-:6],\ \...

If `I=3/4-:5/6,\ \ I I=3-:[(4-:5)-:6],\ \ \ I I I=[3-:(4-:5)]-:6` , `I V=3-:4(5-:6)` , then (a) I and II are equal (b) I and III are equal (c) I and IV are equal (d) All are equal

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