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1. Which of the following is NOT correct?
a. 5/6 - 2/3 = 1/6
c. 1/3 - 2/15 = 3/15
b. 7/12 - 1/3 = 1/4
d. 17/21 - 2/3 = 317
Which of the following differenn 64 HRO​