Question

<br />The bag contains 7 red beads and 4 black beads. When we take a bead from the bag without looking.<br />a) What is the probability of it being red<br />b) Find the number of black beads to be put in the bag so that the probability of getting a black bead come .<br />1/2​

Answer 1

Explanation:

probability of red bead =7/11

black bead=4/11