Question

we have 100 pens in packet in the packet 20 pens are bad and 80 are good wwhat the we take out a pen so what the probability was the pen was good??​

Answer 1

Answer:

Given: A bag contains 6 red, 8 black and 4 white balls and a ball is drawn at random

Required to find: Probability that the ball drawn is not black

Total number of balls 6 + 8 + 4 = 18

Total number of black balls is 8

So, the total number of balls which are not black is 18 – 8 = 10

We know that, Probability = Number of favourable outcomes/ Total number of outcomes

Thus, the probability of drawing a ball which is not black = 10/18 = 5/9

Answer 2

Answer:

Total Pens:- 100

Good pens:- 80

Bad pens:- 20

Probability :- 80/100

4/5