Question
Bag C contains 2 red balls and 2 blue balls, whereas
bag D contains 5 red balls and 5 blue balls. One ball is drawn at random from C and transferred into D. Two balls are now drawn at random from D. Find the probability that both balls are of the same colour.Solution
Required probability
= (2/4) X (6/11) X (5/10) + (2/4) X (5/11) X (4/10) + (2/4) X (5/11) X (4/10) + (2/4) X (6/11) X (5/10) = (2/4) X (30/110) + (2/4) X (20/110) + (2/4) X (20/110) + (2/4) X (30/110) = (60/440) + (40/440) + (40/440) + (60/440) = (200/440) = (5/11)
More Probability Questions
Select the appropriate answer.
Select the word with the incorrect spelling.
- Select the INCORRECTLY spelt word.
From the options given below, select the option which states the correct combination of incorrect sentences.
I. Recently, there has been a lot of...
1) emmisions
2) harass
3) hereditry
4) legetimate
Select the CORRECTLY spelt word.
Choose the word with correct spelling.
- Identify the INCORRECTLY spelt word in the following sentence and select its correct spelling from the given options.
She always accomodates her g... - In each sentence below four words have been printed in bold which are numbered (1), (2), (3) and (4) One of these words may be misspelt or inappropriate in...
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