There are 30 balls, out of which 60% are green balls and the rest are blue balls. How many ways that we can pick the pair of blue balls?A. 21B. 2C. 12.D. none

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sheetalg

  • Dec 29th, 2005
 

the number of blue balls is 12 but the query is about picking pair of blue balls so the answer is (d) none.

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edsel

  • Feb 8th, 2006
 

 Since there are 12 blue balls , the number of ways in picking  a pair of blue balls is 12C2 which is a total of 66 ways . so the answer is d (none)

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