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For all sets A, B and C, if A sub C a...

For all sets A, B and C, if `A sub C` and ` B sub C`, then `A uu B sub C`.

Text Solution

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Let `x in A uu B`
`rArr x in A` and `x in B`
`x in C` and `x in C` , [`:' A sub C` and `B sub C]`
`rArr x in C rArr A uu B sub C`
Hence, given statement is true.
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