Question

There are 10 red, 5 blue and 20 black balls in a bag. A ball is drawn from the bag without looking into the bag. What is the probability of getting a blue ball?

Answer 1

we have 10 red balls

5 blue balls

and 20 black balls

we know that p(x)= no.of favourable outcome/total no.of outcome

we have to find the probability of blue balls

so,

P(x)= 5/35

=1/7.

Answer 2

$\huge\underline\mathfrak\pink{Question}$

There are 10 red, 5 blue and 20 black balls in a bag. A ball is drawn from the bag without looking into the bag. What is the probability of getting a blue ball?

$\huge\bf\green{Answer}$

The answer is 3/7

The probability that a red ball is drawn at random from the bag is 10/15.

Assuming the first ball was red, then the probability of picking a second red ball is now 9/14. (You don’t need to worry about whether the first ball was blue, because if it was, both balls cannot be red, so picking a red ball first is the only probability you need to consider)

Multiply the two probabilities together and you have the combined probability of both balls being red.

10/15 * 9/14 = 90/ 210 = 3/7...

$\huge\boxed{\fcolorbox{red}{yellow}{Hope it helps}}$