Factorials 5 || Number Systems || Quantitative Aptitude || CAT Preparation 2024

Where we find quizes

Sir from where to solve quiz ?
like you mentioned in the end of this video. pls help

Thank you so much sir

SIr where can i find quizes?

Sir can u please reupload the quizzes.. I can't find here

Thanks a lot sir ❤️

Please explain how is rightmost digit of 100 is 1....

Please explain how rightmost digit of 100 is 1...

Sir why did you take right most digit of hundred as 1 it should be zero ? Right!

Sir...in d last question....when u were solving for....24×21....u have taken 04 as last two digits....but...we r actually want....last 2 non- zero digits na....then y have u taken...0 there?

Can you plz tell my answer

In the question of rightward non zero digit of 99!
How is the R(100)= 1 instead of 0
Pls tell

Nonsense kuch bhi sikha rha h....

What’s the explanation for 4*(3! 2!)

How to derive that formula ? Any link to the same?

2023 cat

sir what about 97!?
i m getting
4=R(97)*16
=>0.5=R(97!)
how to do this,if anyone is reading this comment please consider this question and answer

can we do the same method for 79! using 80! which is equal to 80*79!?

99=25*4+(-1)
How's that ?

Sir i don't understand anything😩🥺

Some one help me

I'm not able to understand this concept

Using the formula for R 2(n!) for getting the last 2 nonzero digits, I am getting correct results for all numbers except multiples of such as 25,30 etc. Please tell me what I am doing wrongly Ravi sir. Also how to use this formula quickly for larger numbers with a= 15,20 etc ??

video k last part mein to sir 5a+1 ka hi istamal kiya baki jo 5a+2 , 5a+3....5a+b tak to istamal nahi kiya....waisa ek example dikha dijiye plssss

Where will I find the quizzes sir?

you are a godsend 😭🙏🏻 most useful classes i’ve ever gotten on the internet

Thank you Sir 🙏.

Were can i find quizes that sir is mentioning

sir saurav here what would we do in last question scenario if the a!>4 .. it would automatically add one zero at the end

Where to find questions for practice?

can anyone solve last 2 non zero digit of 31!

Great video sir, I wanted to add that when we have numbers that are not closer to 100 and are far from multiples of 25, in that case, it will be lengthy to use the reverse methodology, I feel it will be easier to use the division by 5 formula until we get smaller factorials (in this case we need to remember 2^10 = 1024, this might n=be useful for higher power of 2).

Can some one tel me why 3*4 factorial he has taken

Should i can use this for Atc aai exam?

How we will solve last two digits of 25!

Where to get assignment and quizez

For anyone trying to calculate R(98!) and got struck

you have to think like this

i was calculating R(98!)

at last the equation was

4=9 .R(98!)

DONT DO DIVISION


here in your mind ,you should have the thought: what should i multiply by 9 such that 4 comes after the multiplication(LHS)

automatically 6 comes as your answer

This logic also satisfies for R( 99!)

4=1.R(99!)

what should i multiply in 1 such that 4 comes after multiplication?
answer will be 4

4! Is 24 how???

we can use the concept of unit digit to find the last digit, if the power is huge, for 4, if the power is odd, take the last digit 4 and if the power is even take the last digit 6

How is the last most digit of 100 is 1? In the second problem (calculating the non zero digit of 99!)
Can anyone explain?

How did we got a=3 and b=4 pls somebody explain

sir for 25 a=5 and b=0 but when we solve for R2 i am getting 00 as the last two digits of answer..... sir please tell me how to solve this?

Fun fact is last non zero digit of 31! Is o itself 😂😂

hoping for best results sir, my first attempt