Question

A certain box contains only black, blue and
red pens. If the probability of choosing a
black pen is 1/4 and the probability of
choosing a blue pen is 1/6 .What is the
probability of choosing a red pen?
(A)
(B)
(C)
(D)
(E) Answer cannot be determined​

Answer 1

Answer:

Step-by-step explanation:

Let P1,P2 and P3 are probability of selecting blue ,black and red pen

then P1+P2+P3=1

1/6+1/4+P3=1

P3=1-1/6-1/4

=1/12( 12-2-3)

P(red)=7/12