Question

On a spinner:

p (3)= 1/6 and the p (4) = 2/5
what is the probability of getting a 3 or 4

Answer 1

For this you use the OR rule (which means you add both of the probabilities) :
1/3 + 2/5

Make common denominators:
5/15 + 6/15

Add them:

= 11/15