SOLUTION: 7 cards are marked with a diferent number from 1-7, then placed face down on a table. One card is selected at random and not placed. A second card is then taken, at random . Determ

Question 646776: 7 cards are marked with a diferent number from 1-7, then placed face down on a table. One card is selected at random and not placed. A second card is then taken, at random . Determine the probabity that one card has an odd number on it.
This is the question I am unsure about. I found out that the probability for the first card that is picked up is 4/7 and for the second card the probability is 3/6 but I am not sure how to then use that info to get an answer to the writing above? Could you help?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!

 

Hi,

7 cards, 4 with odd numbers

draw 1 w/o replacement and draw another 

P(one odd) =   

OR 

4/7*3/6 + 3/7*4/6 = 12/42 + 12/42 = 24/42 = 4/7 

RELATED QUESTIONS

You have a deck of 52 playing cards with 13
spades, 13 diamonds, 13 hearts, and 13... (answered by lynnlo)
One card is selected at random from a standard deck, not replaced, and then a second card  (answered by stanbon,Alan3354)
Two students, Katie and Carly, are playing a game that uses ten different numbered cards... (answered by stanbon)
ten cards are numbered from 1 to 10 and placed in a box. One card is selected at random... (answered by user_dude2008)
If a standard deck of 52 cards are placed on a table faced down, what is the probability... (answered by Alan3354)
cards marked with numbers 5 to 50, are placed in a box and mixed thoroughly. a card is... (answered by Fombitz)
Four cards with "girl" printed on them and five cards with "boy" printed on them are... (answered by stanbon)
when playing bingo, 75 balls are placed in a bin and balls are selected at random. each... (answered by stanbon)
Select a card. one card is selected at random from a deck of cards. Determine the... (answered by nerdybill)