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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? 
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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
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sayali 11 Nov 2014 10:58 PM
thanks .....a very beautiful explanation

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Mohamed Suhail 06 Nov 2014 1:54 PM
this is perfect!! thanks a million :D
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nadan naik 30 Sep 2014 11:11 AM
nice super explanation
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Ravi Rawat 23 Sep 2014 7:12 PM
Excellent description..Thanx a lot dear..GBU.!!
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shoaib 08 Sep 2014 10:41 PM
wow! its ossom to study here.......these quest are repeated in mnc companies

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Rubi 14 Aug 2014 8:56 AM
It clears my doubts awesomely what is the difference between permutation and combination. Very good job
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Shakti Gayatri Panda 30 Jun 2014 8:49 AM
Its so nice and better explaination to understand.
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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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