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Let A={3,6, 12 , 15 , 18 , 21},\ B={4,8,...

Let `A={3,6, 12 , 15 , 18 , 21},\ B={4,8, 12 , 16 , 20},\ C={2,4,6,8, 10 , 12 , 14 , 16}a n d\ D={5, 10 , 15 , 20}` . Find: `A-B`

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We have given `A={3,6, 12 , 15 , 18 , 21}`, `B={4,8, 12 , 16 , 20}`,`C={2,4,6,8, 10 , 12 , 14 , 16}` a n d `\ D={5, 10 ,15,20} `
Then the `A - B` is the set of all elements that are in A but not in `B`,
`\Rightarrow` `A - B``={3,6,12,15,18,21}-{4,8,12,16,20}= {3, 6, 15, 18, 21}`
Hence we have `A-B``= {3, 6, 15, 18, 21}`.
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