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Counting back from 5, what number follows 4?
Q1. Counting back from 5, what number follows 4?
The answer is 3.
Counting back from a number is a strategy that builds children's mental math skills
5 , then 4, x
The number that comes after 4 is 3 because you're counting
back.
But going in the direction of 1, the one behind 4 would be 5; wouldn't the answer be 5?
Because if the numbers are going in the direction of 1, then behind/following 4 would be 5.
Another form
The answer is 3.
5, 4, 3, 2, 1
The number after 4 is 3.
Q2. You are planning to take three exams. According to the records, the failure rates for the exams A, B
You are planning to take three exams. According to the records, the failure rates for the exams A, B, and C are 10%, 20%, and 30%, respectively. Assume that the passing rates for all exams are independent events:
- What is the probability that you will pass only one exam?
- What is the probability that you will pass at least one exam?
- Given that you have passed at least one of the exams, what is the probability that you have passed only one exam?
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