World Brain Tumor Day
Number System - Types of Number
This post forms a basis of many other topics in quantitative aptitude . Let us begin by understanding various types of numbers. (1) Natural Numbers: All the counting numbers are called natural number. Example: 1, 2, 3, 4, 5, ...... (a) Even Numbers: The numbers which are exactly divisible by 2 are called even numbers. Example: 2, 4, 6, 8, ... (b) Odd Numbers: The numbers which leave a remainder 1 when divided by 2 are called odd numbers. Example: 1, 3, 5, 7, .... (c) Prime Numbers: If a number is not divisible by any other number except 1 and itself, it is called a prime number. Example: 2, 3, 5, 7, 11, .... Co-primes ® Two numbers which have no common factor between them except 1 are said to be co-prime to each other. The two numbers individually may be prime or composite. Example: 13 and 29 are co-primes. (d) Composite Numbers: Numbers which are divisible by other numbers along with 1 and itself are called composite numbers. Example: 4, 6, 8, 9, 10, ..... The number 1 is neither prim...
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