Well, we start with 24 students (as stated). We take that and divide it by 2 for the amount of BOIs. We get 12. Only 1/3 of them have brown hair, so divide 12 by 3 and we get 4. Your answer is <u>4</u>.
Explicit rule, because you can find the 40th term directly using the explicit rule. You would need to find the first 39 terms before finding the 40th terms using recursive rule.
