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{apple,orange} that is the solution set. it could be in words or maybe in numbers

{xlx is all counting numbers} counting numbers are 1,2,3...... it is also called natural numbers and positive numbers .

{1,2,3.....} it is the form of number in a set solution

the subset is like for example i have red color bubble gum, blue color bubble gum and orange color bubble gum in my wallet.

the red bubble gum is subset of bubble gum in my wallet.

the blue bubble gum is subset of bubble gum in my wallet.

the orange bubble gum is subset of bubble gum in my wallet.

but the bubble gum in my wallet is not subset of the three.

the subset it is a part of the whole

like in number like for example the counting numbers

1 is subset of counting numbers

counting numbers is not subset of 1