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# Positive integers Z+ ={1, 2, 3, 4, ..........+∞}

Negative integers Z- ={-∞,..........-3, -2, -1}

# Rational numbers Q

All the numbers of the form p/q, where p an q are integers and b ≠ 0 are called rational numbers and their set is denoted by Q.

i.e. Q=p/q such that a, b ε Z and b≠0 and HCF of a,b is 1.

1. Every integer is a rational number as it could be written as Q=p/q

2. All recurring decimals are rational numbers e.g. Q= 1/3= 0.333333.

# Irrational numbers Qc

Those values which neither terminate nor could be expressed as recurring decimals are called irrational numbers i.e. it cannot be expressed as p/q form, and are denoted by Qc

e.g. = 1.41421356237309.... , 1+ , -3/ ,

= 3.14159253.....

# Real numbers R

The set which contain both rational and irrational are called real numbers and is denoted by R

R={ ,..............-2, -1, 0, 1, 2, 3, ......13/5, .....16/3.......+ }

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