Number System for CAT

Faculty : Vishal Sharma More than 16 years of experience in CAT training Trained 10000+ students till date

Concept of Unit Digit Q.) What is the Unit Digit of 125A125 Well Most of You Will be Troubled! Need Not Worry...Why?

Let's learn the Concept Basics: So the Idea is to focus on 12 13 ..5 UNIT DIGIT 12 * 13 -..6 22* 23- ....6

Let's understand the question So 125A125 Unit digit? It's nothing but 5A125 We need to learn: UNIT DIGIT Now Let's Find what is that? POWER CYCLE

Power Cycle .2 2A1-2 Unit digit starts repeating after 4 powers.So 2 2/4/8/6 2A2-4 2A3-8 2A4-6 2A5-32 4-4/6/4/6 5- 5/5/5/5 6-6/6/6/6 7-7/9/3/1 8-8/4/2/6 9-9/1/9/1 . So on

So In our Question 5 Q) 137A135 Q) 146A 400

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