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maths doubt - what is wrong here? let A={1,2} (i) 1 belong to A (ii) 1 is a subset  of A (iii) 1 is a proper subset of A
what is wrong here? let A={1,2} (i) 1 belong to A (ii) 1 is a subset of A (iii) 1 is a proper subset of A
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