Question

A bag has 5 red balls and 4 black balls if we pick up randomly a ball what is it's
probability being red and being black?​

Answer 1

SoluTion:

• Number of red balls = 5
• Number of black balls = 4
• Total balls = 9

We know that,

$\large{\boxed{\sf{\red{Probability_{event} = \dfrac{favourable\:outcomes}{Total\:number\:of\:outcomes}}}}}$

★ Probability of getting a red ball.

Here,

• favourable outcomes = 5
• Total number of outcomes = 9

$\longrightarrow$ Probability of getting a red ball = $\dfrac{5}{9}$

Hence, Probability of getting a red ball is $\bold{\dfrac{5}{9}}$

$\rule{200}2$

★ Probability of getting a black ball.

Here,

• favourable outcomes = 4
• total number of outcomes = 9

$\longrightarrow$ Probability of getting a red ball = $\dfrac{4}{9}$

Hence, Probability of getting a red ball is $\bold{\dfrac{4}{9}}$

Answer 2

Step-by-step explanation:

We have total 9 balls among them 5 are red and 4are black if we have to know probability and this is odd the formula of finding out probability of odd (n +1/2)

N = no. of observation

Total observation are 9 then

9 + 1 / 2=5