25-09-2012, 01:50 PM
Quantitative - Arithmetic - Numbers, Divisibility Test, HCF and LCM
Quantitative - Arithmetic -.ppt (Size: 934 KB / Downloads: 83)
Number System
Any system of naming or representing numbers is called as a number system.
In general, a number system is a set of numbers with one or more operations. Number system includes real numbers, complex numbers, rational numbers, irrational numbers, integers, whole numbers, etc.
Prime Numbers:
Any number greater than 1, which has exactly two factors (1 and itself) is called a prime number.
The only even prime number is 2. All prime numbers greater than 3 can be expressed in the form of 6n 1, where n is a positive integer
To check whether a number is prime or not:
(1)Find the square root of the given number.
(2) Ignore the decimal part of the square root, consider only the integral part.
(3) Find all the prime integers less than or equal to the integral part of the square root.
(4) Check whether the given number is divisible by any of these prime numbers.
(5) If the given number is not divisible by any of these prime numbers then it is a prime number, otherwise it is not a prime number.