a,b,c,d,e,f,g sitting in a row what is the probability that a & c sitting adjacent. Choose one
A) 6/7	B) 5/7	C) 4/7	D) 3/7	E) 2/7
total number of arrangement is= 7!= 5040   Favorable event i.e a and b can be arranged in 2! and the remaining can be arranged in 6! since ab can be in any of the four positions.   so 6!*2!/7! = 2/7   ANSW2/7R:2/7
<result>E</result>
a,b,c,d,e,f,g sitting in a row what is the probability that a & c sitting adjacent.