Question

A bag contains 7 white, 3 red and 4 black balls. A bad drawn at random. find the probability that it is a red or black ball?

Answer 1

$Hey\:!!..$

The answer goes here....

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》To find -

Probability of Red ball or Black ball = ?

》Given -

Number of red balls = 3

Number of white balls = 7

Nuumber of black balls = 4

》Solution -

Let us first know what is probability ?

Probability is the measure of something which is likely to happen. We calculate probability of anything by the following formula -

⇒ $Probability=\frac{No.\:of\:favourable\:outcomes}{Total\:Outcomes}$

Now, the probability of getting a red or black ball -

⇒ $\frac{No.\:of\:favourable\:outcomes}{Total\:Outcomes}$

⇒ $\frac{3+4}{3+4+7}$

⇒ $\frac{7}{14}$

⇒ $\frac{1}{2}$

So, the probability of getting a red or black ball is $\frac{1}{2}$ .

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Thanks !!..

Answer 2

Answer -

Probability = favourable outcome/ total outcome

==> 3+4 / 7+3+4

==> 7 / 14

==> 1 / 2