Answer:The probability of the spinner landing on an even number or a multiple of 3 is 1/6.
Step-by-step explanation:

Sample space : {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18}
Total number of outcomes = 18
1) probability of an even number or a multiple of 3
An even number or a multiple of 3 : {6,12,18}
number of outcomes = 3

The probability of the spinner landing on an even number or a multiple of 3 is 
2) Probability of the spinner landing on an odd number or a number between 4 and 15 (both numbers excluded)
An odd number or a number between 4 and 15 (both numbers excluded):
{5,7,9,11,13}
number of outcomes = 5

The probability of the spinner landing on an odd number or a number between 4 and 15 (both numbers excluded) is
.