ssc preparation, important competetion questions, current affairs of india, latest question asked in competetion papers, Number System & Simplification The ten symbols 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 are called digits, which can represent any number. Natural Numbers: These are the numbers (1, 2, 3, etc.) that are used for counting. It is denoted by N. There are infinite natural numbers and the smallest natural number is one (1). Even numbers: Natural numbers which are divisible by 2 are even numbers. It is denoted by E. E = 2, 4, 6, 8, …. Smallest even number is 2. There is no largest even number. Odd numbers: Natural numbers which are not divisible by 2 are odd numbers. It is denoted by O. O = 1, 3, 5, 7, …. Smallest odd number is 1. There is no largest odd number. Download RRB JE Study Material Based on divisibility, there could be two types of natural numbers: Prime and Composite Prime Numbers: Natural numbers which have exactly two factors, i.e
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