17. Mohan has a box of coloured pens, he takes a pen at random from the box. The probability that she
takes a red pen is 0.4 . If the box contains total 50 pens of blue green and red colour and there are 15
blue pens and 15 green pens then answer the following questions:
Probability that he does not take red pen is
(a) 3upon 5 (b) 4upon 5 (c) 2upon 5 (d) 1upon2
Answers
Step-by-step explanation:
probability of getting red pen = 2/5
probability of not getting red pen = 1-2/5
= (5-2)/5
= 3/5
Another method
probability of not getting red pen = probability of getting blue and green pen
probability of not getting red pen = 30/50
= 3/5
Answer:
The correct option is: a) 3/5
Step-by-step explanation:
In the question, it is given that Mohan has a box of colored pens. The total number of pens = 50
There are three types of pens: blue, green, and red in color. The number of blue and green pens is 15 each.
So, number of Red Pens= 50 -(15+15) = 20
The probability that he does not take red pen =
Total no. of pens - No. of Red Pens / Total no. of Pens
= (50-20)/50
=30/50
=3/5 which is option A
ALTERNATIVE METHOD:
It is given in the question that the probability of him taking out a red pen is 0.4.
∴ The probability of him not taking out a red pen =
1 - Probability of him taking out a red pen
= 1 - 0.4 = 0.6
=60/100
=3/5