Question

in a bag, there are 4 red shapes, 5 blue shapes, and 3 yellow shapes. there is one triangle, one square, and one circle in each group. there is 1 red and blue rectangle, and 1 blue hexagon. what is the probability of selecting a shape that is blue or a triangle?

Answer 1

Answer: 7/12

Step-by-step explanation:

The general addition rule is as follows: P(a or b) = P(a) + P(b) - P(a and b). In the context of this problem, the probability that selecting a shape that is blue is 5/12. The probability of selecting a triangle is 3/12. The probability that the shape is blue and a triangle is 1/12. If we substitute these values into the equation, we get P(B or T) = 5/12 + 3/12 - 1/12 = 7/12. We subtract the probability of the shape being blue and a triangle because we do not want to count a shape twice.