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SUBSET: A set P is said to be a subset of a set Q if each element of P is also an element of Q. If P is subset of Q, we write $$\text{P}\subseteq \text{Q}$$ PROPER SUBSET: If $$\text{P}\subseteq \,\text{Q}$$ and $$\text{P}\ne \text{Q}$$ then P is called a proper subset of Q and we write […]