Combi problem (with number theory I suppose?)
This is not relevant for jee but the first part was easy but the second one seems to elude me, case-working for small numbers didn't help either.
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@Apu
Note for OP
+solved @user1 @user2... to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.Ooohhh this looks fun
Ikr. Randomly stumbled upon a nice book.
Which
?
I was tryna download 102 problems in combi, but accidentally wrote 50. So this is "50 challenging problems in combinatorics"
Okay, using a calculator it seems 6 and 15 case works but seems hectic without the same :/
Yeah
You need to check 8r²-8r+1 for being a perfect square right?
Making a quadratic in the total number of socks right?
Yup
Tried the above, but didn't seem to work.
@SirLancelotDuLac this works ig?
b is no.of black
n is total
Plugging the answer in the original condition contradicts tho...
Yeah idk what happened
Hm...I don't see anything wrong tho :sweaty:
Maths ain't mathing
+solved @Opt
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