A bag contains 3 red balls, 4 blue balls and 1 yellow ball, all the balls being identical in shape and size. If a ball is taken out of the bag without looking into it; find the probability that the ball is red.
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The total number of balls in the bag =3+4+1=8 balls
So, the number of possible outcomes =8=n(S)
Event of drawing a red ball =R,R,R
Thus, probability of drawing a red ball =n(E)/n(S)=3/8