Five booksâ€ Math, Physics, Chemistry, Biology and Commerceâ€ are going to place on each other. The math book & biology book should not be together, and the others can placed in any order. How many possible configurations are there for the books?
Choose the correct choice from the following:
A) 110  B) 112  C) 48  D) 60  E) 68
the total no. of configuration for placing books are permutation of five item   5p5=5!=120   now the no. of ways in which math and biology will come together is 4Ã—2=8.   so by subtracting 8 to total no. of configuration give us the value in which math and biology book will not come together.   120-8= 
<gadget id="calculator">120-8</gadget>
<output>112</output>
112.   answer 112
<result>B</result>
Five booksâ€ Math, Physics, Chemistry, Biology and Commerceâ€ are going to place on each other. The math book & biology book should not be together, and the others can placed in any order. How many possible configurations are there for the books?