Quantitative Aptitude: Number System
A.) Basic Concepts: Common things related to topic: Natural Numbers: Orders or Counting numbers is known as Natural numbers. Example: 1,2,3,4,... Whole Numbers: A positive integers starting from 0 is known as Whole numbers. Example: 0,1,2,3,4,... Prime Numbers: A number which has no factor and or also which can't be divisible by any number is known as Prime numbers. Example: 2,3,5,7,11. Of all the numbers, 2 is the only even prime number. Integer: An Integer is any number in the set. Example: -2,-1,0,1,2... Even Numbers: A number which is exactly divisible by 2 is known as Even numbers. Even numbers is said to be number which is placed in unit digit. Example: 2,6,18,24.... Odd Numbers: A number which is not divisible by 2 is known as Odd numbers. Odd numbers is said to be number which is placed in unit digit. Example: 1,3,7,11,13... Real Numbers: All rational and irrational number is called as Real Numbers....