Mohan has a box of coloured pens. He takes a pen at random from the box. The probabilitythat she takes a red is 0.4.If thebox contains15 blue pens and 15 green pens, rest red pens, thenAnswer the following questions: (i)What is the probability that she doesnot take red pen . (ii) Find the number of red pen in the box.
Answers 1
box has 15 green, 15 blue , x red pens
total no. of pens = 15+15+x = 30+x
p(red) =no. of red pens/total no. of pens
= x/30+x
= 0.4
x= 12+0.4x
0.6x = 12
x = 20
box has 20 red pens
p(not red) = 1-p(red)
= 1-0.4 = 0.6
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