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Examples on the Principle (Part I)
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Sachin Rana is teaching live on Unacademy Plus

Sachin Rana
IVth Year UG, IIT Bombay | YouTuber (150k subs) | No. 1 educator for Organic Chemistry.

Comments
(33)
U
Unacademy user
sir please try translate what u said in Hindi also sir.. I'm sorry to say this I don't know Hindi sir.. plz try to translate whatever u say in Hindi.. plz follow this from ur next classes sir..
U
Bhaiya how you decided in first question that 2 raise power 9 will be last case
In the homework q. " different " balls are given so there is a red ball r1 , r2 and so on. My answer is 25200 .
so 6 is the correct one??
i got the answer in two different ways.In first way i got 425 and the other 630 I want to know why my second way is wrong this is my second method 5R and 6W _ _ _ _ _ _ 5C2 any two red balls ,6C2 any two white balls four places are filled and we are felt with other 7(3 red and 4 white) balls and 2 places then that means 7C2 5C2 *6C2*7C2 =3150
i have come up with 3150
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