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a) 1/2 × 1/3 + 1/2 × 1/5 + 1/2 × 8/15=
b) 7/15 × 3/7 - 1/5 × 3/7 + 1/3 × 3/7=
c) 5/32 × 3/4 + 5/4 × 3/8=


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