Ask a New Question

Question

You have cards numbered 1-10 and a number cube what are the odds of getting two prime numbers? The book says 1\5 but how do they get it.
11 years ago

Answers

Reiny
I assume you pick a card, then throw the die

primes from 1-10 : 2,3,5,7 , so 4 of them
primes on a die: 2 3 5, so 3 of them
prob(2 primes) = (4/10)(3/6) = 1/5
prob(not 2 primes) = 4/5

odds in favour of getting two primes = (1/5) : (4/5
= 1 : 4
11 years ago

Related Questions

cards numbered 0 through 9 are in a bag. what is the probability you pull a card with a number great... a set of 20 cards is numbered 1,2,3,... ..20. Suppose you pick a card at random without looking. Fin... There are 5 cards numbered 1,2,3,4,5 in a bag. There is also a fair coin that is tossed what is t... Nine cards are numbered 1-9. what is the probability of drawing a number greater than 6 or an odd nu... Five red cards numbered 1,2,3,4,5 and two black cards both numbered 5 are randomly ordered face-down... Some cards are numbered from 1 to 30. They are reshuffled and arranged. Find the probability that it... six cards are numbered 1 1 6 7 11 and 12 cards are chosen without replacement until a card number 1... A set of 15 cards numbered 1 to 15. One card is drawn at random. What is the probability that it is... 10 cards are numbered from 1 through 10. The cards are drawn at random. If two cards are drawn with... A set of 48 cards is numbered with positive integers from 1 to 48. If the cards are shuffled and one...
Ask a New Question
Archives Contact Us Privacy Policy Terms of Use