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Take 2-3 answers for exercises after class in mathematics.
The probability that all five people are AB is (0.03) 5;

The probability that all four people are AB is (0.03) 4 * (1-0.03);

The probability that all three people are AB is (0.03) 3 * (1-0.03) 2;

The probability that two people are AB is (0.03) 2 * (1-0.03) 3;

The probability that a person is all AB is (0.03) * (1-0.03) 4;

Then the probability that no one is AB is (1- above).