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Let A={5,6,7,8,9,10} and B={x:x is root ...

Let A={5,6,7,8,9,10} and B={x:x is root of the equaltion `x^(2)-11x+30=0)`. Show that `A cup B=A`

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A={5,6,7,8,9,10}
B={6,5}
`A cup B={5,6,7,8,9,10}`
=A
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