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For a set {1, 2, {1, 2, 3}}. Which of th...

For a set `{1, 2, {1, 2, 3}}`. Which of the following statement is false?

A

`{1,2} in {1,2,{1,2,3}}`

B

`{1,2} subseteq {1,2,{1,2,3}}`

C

`{1,2,3} subseteq {1,2,{1,2,3}}`

D

`3 in {1,2,{1,2,3}}`

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The correct Answer is:
A, C, D
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