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c) 4 1/3 - 1/3= 13/3-1/3= 12/3 = 4
d) 2 2/5 - 3 4/10 = 12/5 - 34/10 = 24/10 - 34/10 = - 10/10= -1
e) 13/21 * 84 / 52 = 1092 / 1092 = 1
f) 3 1/11 * 11/17= 34/11 * 11/17= 34/17 = 2