A board game spinner is divided into three regions labeled , and . The probability of the arrow stopping on region is and on region is. What is the probability of the arrow stopping on region ? Express your answer as a common fraction.
Since the sum of the probabilites = 1, we have
1 - (1/2) - (1/5) =
10/10 - 5/10 - 2/10 =
3/10 and that's the probability of landing in region C
, 
and 
. The probability of the arrow stopping on region 
and on region 
. What is the probability of the arrow stopping on region 
