1. BASICS NUMBERS
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1) Real_numbers (Cat syllabus)
2) Imaginary_numbers ( not in cat syllabus)
*Real numbers ranges from (-infinite to infinite). It includes all points below
I) Integers : { -infi..-3,-2,-1,0,1,2,3…infi}
2) Natural_numbers : {1,2,3,…infi}
3) Whole_numbers...
Wednesday, 3 June 2015
How to determine if the number is prime
Any number greater than 3 if gives a remainder of 1 or 5 when divided by 6 then it may be a prime and if not then it’s definitely not a prime.
When we have to check if a number N is prime, we need to only check for its divisibility by prime factors below root(N).
Lets check 239, 15 < root(239) < 16
Prime numbers below 15 => 2,3,5,7,11,13.
As 239 is not divisible by any of...
