Friday

August 22, 2014

August 22, 2014

Posted by **m** on Tuesday, November 30, 2010 at 9:47am.

I know there are 4 primes-2,3,5,7 and 5 even numbers 2,4,6,8,10

not sure how to figure the probability

- math -
**Reiny**, Tuesday, November 30, 2010 at 10:33amIt could be

PE or EP

what messes things up is that the 2 is in both groups

PE:

case 1: the 2 was picked as the prime

prob of that is (1/10)(4/9)

case 2: the 2 was not picked as the prime

prob of that is (3/10)(5/9)

so prob (PE) = 4/90 + 15/90 = 19/90

EP:

case 1: the 2 was picked as the even

prob = (1/10)(3/9) = 3/90

case 2: the 2 was not picked as the even

prob = (4/10)(4/9) = 16/90

prob(EP) = 3/90 + 16/90 = 19/90

so prob of (one prime and one even) = 19/90 + 19/90 = 19/45

**Related Questions**

Math - The numbers 1-10 are placed on cards, and the cards are put in a hat. If ...

Math - two cards are drawn without replacement from an ordinary deck of 52 ...

Math - Two cards are drawn without replacement from an ordinary deck of 52 ...

math - two cards are selected at random without replacement from a well-shuffled...

statistics - The red face cards and the black cards numbered 2-9 are put into a ...

Math - I can not seem to figure out this question. Can someone please help? Two ...

Grade 12 Data Management - Two cards are drawn without replacement from a deck ...

AP Statistics - A standard deck of cards consisting of 52 cards, 13 in each of 4...

probability/math - Three cards are drawn without replacement from an ordinary ...

algebra2 - Two cards are drawn at random froma standard deck of 52 cards without...