Task: Question Answering
Input (English): Problem: { - 10, - 6, - 5, - 4, - 2.5, - 1, 0, 2.5, 4, 6, 7, 10 } a number is to be selected at random from the set above. what is the probability that the number selected will be a solution of the equation ( x + 5 ) ( x + 10 ) ( 2 x - 5 ) = 0 ?
Options: a. 1 / 12, b. 1 / 6, c. 1 / 4, d. 1 / 3, e. 1 / 2
Output (English): c