Question

In a bag which contains 60 pens , there are 27 blue pens and some black and red pens . If two pens are picked up from the bag without replacement , then the probability of the first pen being blue and second being black is 9/59.Find the number of red in the bag . A. 16 B. 13 C. 10 D. 14 Select the correct answer from above options

Answer 1

Correct Answer - B Total pens = 60 blue pens = 27 Let black pens are x then , `(27)/(60)xx(x)/(59)=(9)/(59)` `implies x=20` `therefore `NO. of red pens `=60-20-27=13`