Conversation started Dec 29, 2020 at 6:44.
YouKnowMe
YouKnowMe
Dec 29, 2020 06:44
in Explorers of the Deep, 13 hours ago, by Hrishabh Nayal
think about it like this:
Suppose we have to choose 3 items out of 5, in how many ways can we do that?
$^5C_3$ i.e:
in Explorers of the Deep, 13 hours ago, by Hrishabh Nayal
1,2,3
1,2,4
1,2,5
2,3,4
2,3,5
3,4,5
1,3,4
1,3,5
1,4,5
2,4,5
in Explorers of the Deep, 13 hours ago, by Hrishabh Nayal
and for choosing 2 out of 5(i.e $^5C_2$):
in Explorers of the Deep, 13 hours ago, by Hrishabh Nayal
if you want to look a bit more orderly :
1,2
1,3
1,4
1,5
2,3
2,4
2,5
3,4
3,5
4,5
in Explorers of the Deep, 13 hours ago, by Hrishabh Nayal
I wrote them in that order in the first one to show you that list 2 is just complementary of list 1. (You need to think about this a little hard for you to understand it)
in Explorers of the Deep, 13 hours ago, by Hrishabh Nayal
@RajdeepSindhu You need to really observe how those two lists are just the same thing i.e if you choose any 3 unique objects you have rejected 2 unique objects automatically in that process
 
Conversation ended Dec 29, 2020 at 6:46.