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What is the probability of getting a factor of 5 if you roll 1 dice twice?
Assuming that it is a fair die, the answer is 5/9.
What is the probability of getting a factor of 10?
1 out of 2
What is the probability of getting a factor of 12?
5 out of 6
What is the probability of getting a head or a tail when spinning 2 coins?
The "or" in the statement is addition; so even with one coin the probability of getting a head or a tail when spinning it is 1, and since the probability can never be greater than 1, the answer is 1. Correct. I suspect the questioner means something different. Probability of getting H & H = 1/2x1/2 = 1/4 Probability of getting H & T = 1/2 x 1/2 = 1/4 Probability of getting T & H = 1/2 x 1/2 = 1/4 Probability of getting T & T = 1/2 x 1/2 = 1/4 So probability of getting just 1 head = 1/4 +1/4 = 1/2 Probability of getting 2 heads = 1/4 So probability of getting 1 or 2 heads = 1/2 + 1/4 = 3/4 Probability of not getting a head = 1/4 Similarly for switching heads and tails.
What is the probability of getting 3 heads from 4 coin tosses?
The probability is 1 out of 5
