Posted by is this right!!! on Tuesday, June 16, 2009 at 11:03am.
A die is rolled once. What are the odds against rolling a prime number? 2

math  Reiny, Tuesday, June 16, 2009 at 11:11am
odds in favour of some event
= prob(of that event/prob(not that event)
primes form 1 to 6 are 2,3, and 5
so prob of a prime = 3/6 = 1/2
so prob of not a prime = 11/2 = 1/2
so the odds in favour of a nonprime = (1/2) รท (1/2)
= 1:1

math  John, Tuesday, June 16, 2009 at 11:16am
first off, what are the prime numbers?
a prime number is any number divisible by one and itself.
1, 2, 3, 5, are all prime numbers.
although 1 can be controversial. Some teachers consider 1 as a prime but some not. anyways assuming 1 is a prime. there is a total of 4 primes.
a dice has six sides of six numbers total.
so the probablility of rolling a prime number is:
4/6 and if you simplify: 2/3
but if you don't consider 1 as a prime:
the answer would be: 3/6 and simplify: 1/2

math  Reiny, Tuesday, June 16, 2009 at 11:21am
Euler considered 2 to be the first prime, and who are we to argue against Euler.

math  hannah, Saturday, March 26, 2011 at 8:10pm
yes
Answer This Question
Related Questions
 math  A single die is rolled once. What are the odds against rolling a prime ...
 pre algebra  Two 6sided dice are rolled. Find the odds of rolling s sum that ...
 Probability  A number cube, numbered 1 through 6, is rolled once. What is the ...
 Math  Two dice are rolled. Find the probability that an even number is rolled ...
 Math  Two dice are rolled. Find the probability that a multiple of three is ...
 math  A standard die is rolled three times. What is the probability that a ...
 PreAlgebra  These are 2 problems that I'm stuck on; I know the answers to them...
 math 157  Consider the experiment involving rolling a single die once. What is ...
 math  a die is rolled in such a way that even faces are twice as likely to ...
 MATH!  An experiment consists of rolling a weighted die. The probability of ...
More Related Questions