13 Replies
Hello @Jeepaglu!
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Choose the subject for the respective doubt :)
My process is that ek couple se ek choose karo, choose karne ke 2 tarike
Do it for 4 couples
@silverdew
You might be confusing multiplication thm.
is the answer 16?
Because 4 couples mein se ek ek choose karna hai toh that's (2)^(4C1) which is 16
And not 4C1 times 2!
you can select either one from the first couple so 2C1 = 2
either one from the second, so 2 ways
and third and fourth
so
222*2 = 16
I feel the exact mistake is your solution gives a sense of 'choose a couple first then select one of them' then 'choose the second couple and select one of them'
So it gives an ORDER for the couples..
in reality we need to SELECT
Yeah
2^ kahan se aa gaya
Oh ic
To be more specific
In your solution a couple is chosen first and then a member of that couple
Why?
It's the exact difference between permutation and combination
Permutation gives a sense of arrangement.. Some element comes first and then second.. But in combinations you just
Select
Ahhhh
I see
So my mistake is
Seeing the ways in which we can choose the couple Atwell
Aswell
Exactly your one ORDERS the couples
Yeah I understand it now
+solved @Agnibesh @silverdew @SirLancelotDuLac
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