Varying Probabilities

Consider a fair spinner with five sections labeled 1, 2, 3, 4, and 5. The probability for landing on region 1 is one-fifth, region 2 is one-eighth, region 3 is one-third, and regions 4 and 5 have unknown probabilities. The spinner can only land on one section at a time.

Describe the possible probabilities of landing in region 4 or region 5. Draw a diagram to assist your explanation.