Which of the following is true? *
{1,2}⊂{1,{2},3}
{2,{1}}⊂{1,{2},3}
{2}⊂{1,{2},3}
{1,{2}}⊂{1,{2},3}
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Answer:
{2}⊂{1,{2},3}
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{2}⊂{1,{2},3}
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