Concept explainers
There are 20 marbles in a bag. The probability that you pick one red marble at random is
What is the probability that you will pick two red marbles in a row if you do not replace the first? Explain.
Find the probability that you will pick two red marbles in a row if you do not replace the first.
Answer to Problem 6STP
Explanation of Solution
Given:
There are 20 marbles in a bag.The probability that you pick one red marble at random is
Formula Used:
Calculation:
Total number of marbles in the bag = 20
Let red marbles in the bag = x
Number of favourable outcomes of red marble = x
So, number of red marbles in the bag = 4
Total number of marbles after the first pick , without replacement = 19
Number of favourable outcomes of red marbles in second pick = 3 (since first pick is without replacement)
So, the probability of picking two red marbles in a row , without replacement of the first is
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