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দীপাঞ্জন কর

· started a discussion

· 1 Months ago

Wrong Answer given (Question: 122185.0 )

the answer is 1/55.. no cap was drawn there.. only two balls were withdrawn..

Question:
A box contains 2 blue balls, 4 red balls, 5 green balls and 1 yellow ball. If two balls are picked randomly, what is the probability that both are blue?
Options:
A) \(\cfrac{1}{55}\)
B) \(\cfrac{1}{22}\)
C) \(\cfrac{1}{33}\)
D) \(\cfrac{1}{66}\)
E) \(\cfrac{1}{6}\)
Solution:
Required probability =  \(\cfrac{^2C_2}{12C_2}=\cfrac{1}{66}\)  

Knowledge Expert

· commented

· 1 Months ago

Given answer 1/66 is correct... Q is: A box contains 2 blue balls, 4 red balls, 5 green balls and 1 yellow ball. If two balls are picked randomly, what is the probability that both are blue?
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