Set: {-10, -6, -5, -4, -2.5, -1, 0, 2.5, 4, 6, 7, 10}
A number is to be selected from the set above. What is the probability that the number selected will be a solution of the equation (x-5)(x+10)(2x-5)=0?
a. 1/12
b. 1/6
c. 1/4
d. 1/3
e. 1/2
My answer was 1/4, but the OA is 1/6. Could someone please explain? Thanks.
Approach: possible solutions x = 5, x = -10, x = 2.5
P = 3/12 = 1/4
A number is to be selected from the set above. What is the probability that the number selected will be a solution of the equation (x-5)(x+10)(2x-5)=0?
a. 1/12
b. 1/6
c. 1/4
d. 1/3
e. 1/2
My answer was 1/4, but the OA is 1/6. Could someone please explain? Thanks.
Approach: possible solutions x = 5, x = -10, x = 2.5
P = 3/12 = 1/4
