There are 30 balls, out of which 60% are green balls and the rest are blue balls. How many ways can we pick the pair of blue balls?

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ramesh230150

  • Jul 14th, 2010
 

60% of 30 is 18 so green balls are 18
and blue balls are 12
out 30 ball we have to draw 2 balls
12
    c
      2
         /30
               c
                  2


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