DATABASE FUNDAMENTALS
DATA WAREHOUSING AND DATA MINING
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
1/36
|
|
|
1/18
|
|
|
5/36
|
|
|
1/6
|
|
|
1/3
|
Detailed explanation-1: -The Question and answers have been prepared according to the JEE exam syllabus. Information about A fair six-sided die is rolled twice. What is the probability of getting 2 on the first roll and not getting 4 on the second roll? a)1/36b)1/18c)5/36d)1/6e)1/3Correct answer is option ‘C’.
Detailed explanation-2: -| Since we don’t care what the outcome of the first roll is, its probability is 1. The second roll of the dice has to match the outcome of the first, so that has a probability of 1/6. The probability of both events occurring is 1 * 1/6.
Detailed explanation-3: -Since there are six possible outcomes, the probability of obtaining any side of the die is 1/6. The probability of rolling a 1 is 1/6, the probability of rolling a 2 is 1/6, and so on.
Detailed explanation-4: -When rolling a standard 6-sided die, what is the probability that I roll a 2 or a 4? Assuming a properly-random die, the probability of any given result appearing is 1/6, or 16ish%. Of any two given results therefore, the likelihood is 33.3%.
Detailed explanation-5: -If a die is rolled twice, the probability of rolling a 5 and then a 2 is 1/36.