Two zone spinner

This task is about probablility as a fraction or percentage. 

spinner

The arrow on the spinner is equally likely to point to the black half of the circle as it is to the white half.
Write each probability as a fraction or as a decimal.

Question 1Change answer

a) What is the probability that in the first spin the arrow lands on the white? 

Question 1Change answer

b)  What is the probability that in two spins the arrow lands so that
i)   both are black?   
ii)  the first is white and the second is black?   
iii) one is black and one is white?   

Question 2Change answer

c)  What is the probability that in the first four spins the arrow always lands on the white?