Answers edited by YoshiMan007

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• Question #294f3
  
• From a pack of 9 cards numbered 1,2,3.......9 , three cards are drawn at random and laid on a table from left to right. What is the probability that the digits are drawn in descending order (by just using permutation)?
  
• I got 300 cubic cm but the answer is 308 on the answer sheet. How?
  
• Different 4 math books , 6 different physics books , 2 different chemistry books are to be arranged on a shelf. how many arrangement is possible if the books in particular subject must stand together ?
  
• How do you solve #\frac { 2x - 1} { x + 2} - \frac { 1} { x } \leq 1#?