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In each of the following , determine whe...

In each of the following , determine whether the statement is true or false. If it is true, prove it. If it is false, give an example.
If `A sub B` and `B sub C`, then `A sub C`

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No. Let .A={1}, B={1, 2}. and .C={1, 2,3} .. Here .A in B. as .A=1. and .B sub C.. But .A not subset C. as .1 in A. and .1 notin C..
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