A pair of dice is rolled and the resulting sum is odd. The complement of this event would be the sum of that is a multiple of 3? True or false

Answer 1

I will let you decipher what is meant by "The complement of this event would be the sum of that is a multiple of 3"
However, of the possible 36 sums, 18 will be odd, and 18 will be even
so Prob(odd) = 18/36 = 1/2

take it from there