A number is selected at random from the set {2, 3, 4, ... 10). Which event, by definition, covers the entire sample space of this experiment? ОА
The number is greater than 2.
ОВ.
The number is not divisible by 5.
O c. The number is even or less than 12.
OD. The number is neither prime nor composite.
O E. The square root of the number is less than 3.

Answer of the question is, it will be sure event

answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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