Aptitude Number System


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 :

  1. Factors
  2. Highest Power
  3. Ending With Zero
  4. Remainder
  5. Unit place
  6. Divisibility

All the six module are describe with example.

Important Formula of Factor

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







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