1.

Which of the following is true?

Answer»

`A={1,7,6}` and `B={7,2,1}` then `1,2,7 in A`
`A={a,b,C}` and `B={b,c,d}` then `a,b,c in B`
`A={a,e,i,o,u}` and `B={a,b,c,d,….,x,y,Z}` then `a,e,i,o,u in B`
`A={1,2,1,2}` and `B={a,b,c}` then, `1,2 in B`

ANSWER :C


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