Find the probability in a group of 10 students sitting in a row , two of them
always sit next to each other	Choose the correct choice from the following choices:	A) 0.5	B) 0.4	C) 0.3	D) 0.2	E) 0.1

Rationale: assume that these 2 students are 1 and then u can sit is 9 ! and these 2 students can sit by 2 ways then total ways are 9 ! * 2 and the probability is 9 ! * 2 / 10 ! = 1 / 5 = 0.2 answer : d
Answer: D