### Basics Concepts and Formulas in Permutations and Combinations

Comments(19)

Shiksha
12 Jan 2015 8:47 PM

Hi,

I have a question, if we have 6 white balls , 3 blue balls and 2 Red balls and we have to pick a selection 4?

a) how many combinations it will be?

b) if always 2 white have to be selected from 4 then how many combinations possible?

Gaurav Dobriyal
23 Jan 2015 6:10 PM

6 3 2

w b r

2 1 1 = No. of ways arrangement is done.

1 2 1

1 1 2

Thus 6c2+3c1+2c1+6c1+3c2+2c1+6c1+3c1+2c2 = 15+3+2+6+3+2+6+3+1=41

if always 2 white then

6c2+3c1+2c1 = 15+3+2=20

sayali
11 Nov 2014 10:58 PM

thanks .....a very beautiful explanation

Mohamed Suhail
06 Nov 2014 1:54 PM

this is perfect!! thanks a million :D

Ravi Rawat
23 Sep 2014 7:12 PM

Excellent description..Thanx a lot dear..GBU.!!

shoaib
08 Sep 2014 10:41 PM

wow! its ossom to study here.......these quest are repeated in mnc companies

Rubi
14 Aug 2014 8:56 AM

It clears my doubts awesomely what is the difference between permutation and combination. Very good job

Shakti Gayatri Panda
30 Jun 2014 8:49 AM

Its so nice and better explaination to understand.

Charika Subhani
18 Jun 2014 12:30 PM

The explanation is so much clear.All the things have been explained in a manner that can be easily uinderstood.

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