math

posted by .

A die is rolled once. What are the odds against rolling a prime number? 2

  • math -

    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 = 1-1/2 = 1/2

    so the odds in favour of a non-prime = (1/2) รท (1/2)
    = 1:1

  • math -

    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 -

    Euler considered 2 to be the first prime, and who are we to argue against Euler.

  • math -

    yes

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Math

    Two dice are rolled. Find the probability that an even number is rolled on one die and an odd number is rolled on the second die.
  2. Math

    Two dice are rolled. Find the probability that a multiple of three is rolled on one die and an even number is rolled on the second die.
  3. Pre-Algebra

    These are 2 problems that I'm stuck on; I know the answers to them but I just don't know how to find that answer. Can someone please help?
  4. math 157

    Consider the experiment involving rolling a single die once. What is P(even and Prime)?
  5. Probability

    A number cube, numbered 1 through 6, is rolled once. What is the probability of rolling an even number that is not prime?
  6. math

    A single die is rolled once. What are the odds against rolling a prime number?
  7. pre algebra

    Two 6-sided dice are rolled. Find the odds of rolling s sum that is a prime number
  8. math

    A standard die is rolled three times. What is the probability that a prime number is rolled on exactly one of the three rolls?
  9. Math 120

    A die is tossed. Find the odds against rolling a number greater than 2 The odds against rolling a number greater than 2 are __ : ___
  10. math

    A red die and a green die have been rolled. (6 sided) What is the probability of the event?

More Similar Questions