10. 𝐴 ⊂ 𝐵

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Solution:

Assume $A=\{1,2,3\}, B=\{1,2,3,4\}$

Now, clearly B contains all the elements of A and B has greater number of elements. So, A is proper subset of B.

Thus, $A\subset B$

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Question ID: mtid-5-stid-8-sqid-842-qpid-727