Number system is a important chapter of aptitude.
To make a good score in aptitude section of competitive exam, interview you must have a good mark in number system.
Number system question is divided into six module :
All the six module are describe with example.
To find the number of factor for a given number
N= ap+bq+cr
Is given by
Number of factor (NF)=(p+1)*(q+1)*(r+1)
To find the number of even factor for a given number
N= ap*bq*cr
Is given by
NF Even=(p)*(q+1)*(r+1)
To find the number of odd factor for a given number
NF Odd=Number of factor-Number of ever factor