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Numbers which cannot be expressed as p/q is known as irrational number.

Eg:- √2, √3, √5, π

Now,

√2 = 1.41421356...

√3 = 1.73205080...

√5 = 2.23606797...

π = 3.14159265...

We note that all the decimal expansion are non- terminating, non-repeating.