Permutations & Combinations Mcqs

Q.  In how many different ways can four books A, B, C and D be arranged one above another in a vertical order such that the books A and B are never in continuous position?

a. 9
b. 12
c. 14
d. 18


ANSWER: See Answer
 
The number of arrangement in which A and B are not together

= Total number of arrangements

= Number of arrangements in which A and B are together =4!-3!x2! = 24-12 =12.
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