Recive the topic untill...

In today's class we just discussed about the topic untill we covered in java. And I just go through
Some topics in quantitive aptitude.
I have learnt about what is number system and how the architecture is .
In this number system I have learnt four topics.

1. How number system divides
2. Unit digit
3. Sum of series
4. Divisibility rules

1)How number system divides:

2) Divisibility rules:

3)Unit digits:

4) Sum of series:

Come accross the simple logic, tricks and simple formulas we can easily solve the following problems.