Complementary probabilities
This task is about probability as a fraction.
a)

The prizes in a raffle are either a supermarket voucher or a petrol voucher. The probability of getting a supermarket voucher is \(3 \over 5\).
What is the probability of getting a petrol voucher? __________ 

b) 
The pens in a pencil case are either blue, green, or red. The probability of getting:
What is the probability of getting a red pen? __________ 

c) 
The balloons given out at a birthday party are either purple, pink, orange, or yellow. The probability of being given:
What is the probability of being given a yellow balloon? __________ 