1. Examples
1. A = {1,2,3,4}, Find |A| ...Solution:Here `A={1,2,3,4}` `:.|A|=4`
2. A = {x<=5; x in N}, Find |A| ...Solution:`A={x<=5; x in N}` `:.A={1,2,3,4,5}` `:.|A|=5`
3. A = {x^2<10; x in N}, Find |A| ...Solution:`A={x^2<10; x in N}` `:.A={1,2,3}` `:.|A|=3`
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