statistics.

[strong wasp]

This looks like an exam but it’s an exam question set by us for homework 👌
How do I do question 14(c)?

[sly elbow]

Use complementary counting

The probability that you get no AB blood types for n people is
$(24/25)^n$

[cerulean owl]

doated

[sly elbow]

So the probability you do is 1 - $(24/25)^n$

[cerulean owl]

doated