a bag contains 3 white balls, 5 red balls and 4 blue balls a ball is drawn at random from the bag what is the probability that the ball drawn is of the following type? i) blue ii)white iii)red iv)not white
Answers
Answer: BOOK ME QUESTION THORA DIFFERENT HAI YE USKA SOL. HAI..
Number of white balls in a bag= 5
Number of red balls in a bag= 7
Number of black balls in a bag= 4
Number of blue balls in a bag= 2
Total Number of balls in a bag= 5 +7+4+2= 18
Total number of favourable outcomes= 18
i) Number of white & blue balls in a bag= 5+2= 7
Number of favourable outcomes= 7
Probability = Number of favourable outcomes/ Total number of outcomes
P(white or blue) = 7/18
ii) Number of red & black balls in a bag= 7+4= 11
Number of favourable outcomes= 11
Probability = Number of favourable outcomes/ Total number of outcomes
P(red or black) = 11/18
iii) Number of not white balls in a bag=
Total number of balls in a bag - number of white balls = 18 -5 = 13
Number of favourable outcomes= 13
Probability = Number of favourable outcomes/ Total number of outcomes
P(not white) = 13 /18
iv) Number of balls neither white nor black in a bag= Total number of balls in a bag - number of white & black balls = 18 -(5+4) = 18 - 9= 9
Number of favourable outcomes= 9
Probability = Number of favourable outcomes/ Total number of outcomes
P(not white) = 9 /18 = ½.