Total parts in which a spinner is divided = 4
Each part is named as 1,2,3,4.→Total possible outcome when spinner gets in the motion.
When we toss a coin , total possible outcome = {H,T}
So, all the possible outcome when Rihana spins the spinner and tosses a coin = {H 1 , H 2, H 3 , H 4, T 1, T 2, T 3, T 4}=8
