Faculty : Vishal Sharma More than 16 years of experience in CAT training Trained 10000+ students till date
Concept of Trailing number of Zero Important Concept of Number System CAT/MBA Entrance
Factorial: Let's Understand it Question is how many trailing zero's are there in 100!? .22.1 3 3.2.1 6 ANY GUESS! SO ON.
Trick is we will look for Co-prime factors of 10 10=5*2 Let's learn the concept Key is to identify how do we get trailing zero.. 2 *10 20 42 * 10 = 420 Focus on 5 Why? So the idea is Multiplication by 10 But then what about 5!- 120 Why do we get zero there?
Let's try the concept . Divide 100 by 5 Quotient 20 . Divide Quotient by 5 New Quotient 4 . We will stop where new quotient on division will be 0 So the number of zero's are 24
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