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Jasmine
Jasmine
07:19
@JohnRennie Morning !
kyle campbell
kyle campbell
I think he's busy with servers.
3
Jasmine
Jasmine
@kylecampbell ok its fine
@kylecampbell are you a JEE aspirant
kyle campbell
kyle campbell
no, I'm a canadian undergrad physics student : )
John Rennie
John Rennie
@Jasmine I'm working I'm afraid. It's a Windows update weekend and I'm clearing up after all the failed updates.
Jasmine
Jasmine
@JohnRennie Fine :-)
@kylecampbell Cool !!
 
2 hours later…
user8718165
user8718165
08:57
hello sir @JohnRennie
John Rennie
John Rennie
@user8718165 hi
user8718165
user8718165
@JohnRennie are you working sir?
John Rennie
John Rennie
I've finished work, but I'm on the phone at the moment ...
user8718165
user8718165
@JohnRennie okay sir...please ping when you're free...:-)
John Rennie
John Rennie
09:16
@user8718165 I'm free now.
user8718165
user8718165
09:35
@JohnRennie Sir I was stuck with a similar problem....Figured it now...thanks for pinging :-)
John Rennie
John Rennie
@user8718165 Cool :-)
user8718165
user8718165
@JohnRennie Sir I got it correct but I want to try it using a method I think should work...can you please tell me why mine isn't?
John Rennie
John Rennie
@user8718165 Yes, I can have a look ...
user8718165
user8718165
@JohnRennie A class of 10 students...3 are girls...In how many ways can they be seated if no two girls are allowed to sit together?
@JohnRennie I did it like 10!-(2*9!)...but that way I'm far away from the ans
John Rennie
John Rennie
You calculate the total number of permutations then subtracted the number of permutations that had two girls sitting together?
user8718165
user8718165
09:44
@JohnRennie yes sir....exactly...I want to do it that way
@JohnRennie Please tell me sir
John Rennie
John Rennie
That should work, so the error must be that you incorrectly calculated the number of ways of seating two girls together.
user8718165
user8718165
@JohnRennie can you tell me just the expression sir?
@JohnRennie using a calculator...but still
@JohnRennie sir
John Rennie
John Rennie
I'm not sure what the expression is for the number of ways two girls can seated together
user8718165
user8718165
@JohnRennie Sir 2*9! Can tell us all ways whether 2 girls are sitting together or all the 3 girls are sitting together.....is that right?
John Rennie
John Rennie
It's obviously not correct because it isn't giving you the correct answer.
user8718165
user8718165
09:53
@JohnRennie LOL
@JohnRennie okay sir...Intuitions don't work well with PnC...I think I should stick with the book
John Rennie
John Rennie
user image
@user8718165 That's from this book
 
1 hour later…
user8718165
user8718165
11:18
@JohnRennie yes sir.... That's the correct answer of the same question... But the book isn't the same though XD
Thanks for the search Sir@JohnRennie
 
9 hours later…
user8718165
user8718165
20:21
hii @Aladdin :-) Why here at such late night?
I'm hardly awake LOL

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