R.S.Aggarwal Quantitative aptitude ebook free download
This is the best book book for understanding number system.This book contains:
Basic concepts, definitions and identities
Number System
Test of divisibility:
1. A number is divisible by ‘2’ if it ends in zero or in a digit which is a multiple of
‘2’i.e. 2,4, 6, 8.
2. A number is divisible by ‘3’, if the sum of the digits is divisible by ‘3’.
3. A number is divisible by ‘4’ if the number formed by the last two digits, i.e. tens
and units are divisible by 4.
4. A number is divisible by ‘5’ if it ends in zero or 5
5. A number is divisible by ‘6’ if it divisible by ‘2’ as well as by ‘3’.
6. A number is divisible by ‘8’ if the number formed by the last three digits, i.e,
hundreds tens and units is divisible by ‘8’.
7. A number is divisible by ‘9’ if the sum of its digit is divisible by ‘9’
8. A number is divisible by ‘10’ if it ends in zero.
9. A number is divisible by ‘11’ if the difference between the sums of the digits in
the even and odd places is zero or a multiple of ‘11’.
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