A box contains 4 white and 6 black balls. If one ball is drawn at random, what i

Practice Questions

Q1
A box contains 4 white and 6 black balls. If one ball is drawn at random, what is the probability that it is black given that it is not white?
  1. 2/5
  2. 3/5
  3. 4/5
  4. 1/5

Questions & Step-by-Step Solutions

A box contains 4 white and 6 black balls. If one ball is drawn at random, what is the probability that it is black given that it is not white?
  • Step 1: Identify the total number of balls in the box. There are 4 white balls and 6 black balls, so the total is 4 + 6 = 10 balls.
  • Step 2: Determine the condition given in the question. We need to find the probability of drawing a black ball given that the ball drawn is not white.
  • Step 3: Since we are only considering the balls that are not white, we only look at the black balls. There are 6 black balls.
  • Step 4: Count the total number of balls that are not white. Since there are 4 white balls, the remaining balls (which are not white) are the 6 black balls.
  • Step 5: Calculate the probability. The probability of drawing a black ball given that it is not white is the number of black balls divided by the total number of balls that are not white. This is 6 (black balls) / 6 (total not white) = 1.
  • Step 6: Conclude that the probability of drawing a black ball given that it is not white is 1.
  • Conditional Probability – The probability of an event occurring given that another event has already occurred.
  • Total Outcomes – Understanding the total number of possible outcomes in a probability scenario.
  • Favorable Outcomes – Identifying the number of outcomes that satisfy the condition of interest.
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