1. 1/2 - 1/21 + 1/15
= 105 - 21 + 14/210
= 84 + 14/210
= 98/210
= 7/30
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1. 1/2 - 1/21 + 1/15
= 105 - 21 + 14/210
= 84 + 14/210
= 98/210
= 7/30