5. Let f(x) = x(x − 1)(x − 2) … (x − 2023) and g(x) = f(f(x)). Calculate g ′ (1).

1. There was a class of 41 people divided into three groups A, B, and C, and the average score of subject natural’s test was 89.7 points; the average score of group A was 89.8 points; the average score of A, B combination was 88.5 points; the average score of A and C combination was 91 points, and how many people were in each of groups A, B and C?