18. There are 5 white, 7 red, 4 black and 2 blueidentical balls in a box. One ball is selectedat random from the box. Find the probabilitythat the selected ball is ( 1 ) either white orblue ( 2 ) eher red or black (3) not white(4 ; neither white, nor black.
Answers
Answered by
2
Step-by-step explanation:
White balls = 5 ,
Red balls = 7
Black balls = 4
Blue balls = 2
Total numbers of balls = (5+7+4+2) = 18
Probability 1) either white or blue
= (white balls+blue balls)/total numbers of balls
= (5+2)/18
= 7/18
2) either red or black
= (Red balls+black balls)/total numbers of balls
= (7+4)/18
= 11/18
3) not white
= (total numbers of balls - white balls)/total numbers of balls
= (18 - 5)/18
= 13/18
4) Neither white nor black
= (Red balls+blue balls)/total numbers of balls
= (7+2)/18
= 9/18 = 1/2
Similar questions