If A = {1, 2, 3, 4}, B = {3, 4, 5, 6}, C...

If `A = {1, 2, 3, 4}, B = {3, 4, 5, 6}, C = {5, 6, 7, 8 } and D = { 7, 8, 9, 10 }`, find
`A ∪ B`

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The correct Answer is:

`{ 1, 2, 3, 4, 5, 6 }`

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