Number System Part – 1 For RRB Group D In Hindi & English

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                                  Basic

Natural number, whole numbers, integers numbers, prime numbers कि definition

1,2,3,4,5…….. ……..Called natural numbers

0 1 2 3 4 5 …………..Whole numbers

-3, -2, -1, 0,1,2 ……..Integers number (all counting number its negative or positive)

1,2,3,4,5,6,……………Positive integers (if negative part will be remove)

-1, 2,3,4,5,…………… Negative integers (if positive part will be removed)

0…………………….. Zero is neither positive or negative integers

Prime Numbers

A number divisible by 1 and itself & not divisible by any other are called prime number

ऐसी संस्थाएं जो या तो 1 से विभाजित हो या खुद से प्राइम नंबर कहलाती है

Example – 2, 3,5,7,11…….

Formula
1 is not a prime number
2 is only the prime number which is even
All prime numbers are Odd