Question

A bag contains 3 red balls and 4 blue balls. If a ball picks from the bag, the probability of it being a red ball is .

• A. $\frac{4}{7}$
• B. $\frac{3}{7}$
• C. $\frac{1}{7}$
• D. $\frac{3}{4}$

Answer 1

The correct option is B $\frac{3}{7}$

Let $E$ be the event of getting a red ball.

Then,$P\left(E\right)=\frac{\text{No. of outcomes favourable to E}}{\text{Total no. of outcomes}}$

Here,
No. of outcomes favourable to E = 3
and Total no. of outcomes = 7.



$\therefore P\left(\text{getting a red ball}\right)=\frac{3}{7}$