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The concept of subset is defined as, a set A is said to be the subset of a set B if every element of set A is also an element of set B, this relationship is usually denoted by and mathematically this relationship is written as, if implies . The concept of subset is also written in the from
If , in this case we say that
A = {2, 3, 4, 5, 6, 7, 8} is proper subset of B = {1, 2, 3, 4, 5, 6, 7, 8}.
If
If we have to show that
The other way to prove that |

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