anonymous
  • anonymous
A Card is drawn from a deck of cards numbered one through twenty. the card is NOT replaced and another card is drawn. find the probibility of the outcome Question: a number greater than 8 and then a number less then 5. a)16/39 b)12/95 c)3/25 D)9/95
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
OK how many number of the 20 cards are greater than 8?
anonymous
  • anonymous
Sorry, how many cards of the 20 are greater than 8?
anonymous
  • anonymous
12

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anonymous
  • anonymous
OK, so the first fraction is 12/20 which reduces down to 3/5. NOW. Here is the difference in this problem. YOU DON"T replace it so it is like laying one of those cards (greater than 8) down on the table. Now when you go to draw the next card... How many cards are less than 5? and How many cards are in the deck?
anonymous
  • anonymous
ok 4 less and 51 cards
anonymous
  • anonymous
Remember there were only 20 cards, but you are right there is one less so that is 19 cards. So the answer is 3/5 * 4/19 = 12/95 Do you understand this?

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