a,b,c,d, sitting in a row what is the probability that a & b sitting adjacent. Pick one
A) 9/2	B) 1/2	C) 3/2	D) 5/2	E) 7/2
total number of arrangement is= 4!= 24   Favorable event i.e a and b can be arranged in 2! and the remaining can be arranged in 3! since ab can be in any of the four positions.   so2!*3!/4! = 1/2   ANSWER:1/2
<result>B</result>
a,b,c,d, sitting in a row what is the probability that a & b sitting adjacent.