Question

Which of the following values could represent the probabilities of complementary events and 28% and 82%  and 

10% and 80% 1/7and2/7
2/5and3/5

Answer 1

2/5 and 3/5

Explanation:

Complementary events have probabilities that sum to 100%, or 1.

28+82 = 110; this is not 100.

10+80 = 90; this is not 100.

1/7+2/7 = 3/7; this is not 1.

2/5+3/5 = 1; this is correct.

Answer 2

The answer is 2/5 and 3/5 as they both add up to 1.00 or 100%