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Question #294f3

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 ?

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)?

How do you solve #\frac { 2x  1} { x + 2}  \frac { 1} { x } \leq 1#?

I got 300 cubic cm but the answer is 308 on the answer sheet. How?