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

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Heading 1: Understanding the Ball Composition: Let's start by understanding the composition of the bag, which contains white, red, and black balls.

Heading 2: Determining Probability for Red or Black Ball: Now, let's calculate the probability of drawing a red or a black ball from the bag.

Sub-heading 1: Counting Red and Black Balls:

• Number of red balls = 3
• Number of black balls = 4

Sub-heading 2: Total Number of Balls in the Bag:

• Total number of balls = 7 (white) + 3 (red) + 4 (black) = 14

Sub-heading 3: Probability Calculation:

• Number of favorable outcomes (red or black) = Number of red balls + Number of black balls = 3 + 4 = 7
• Total number of possible outcomes = Total number of balls = 14
• Probability of drawing a red or a black ball (P(Red or Black)) = Number of favorable outcomes / Total number of possible outcomes
• P(Red or Black) = 7 / 14

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