8. There are 10 balls in a bag numbered from 1 to 10. Three balls are selected at random without replacement.
1 answer:
Answer:
a. 720
b. 0.3
Step-by-step explanation:
a.
Three balls are selected at random without replacement.
First ball can be selected in 10 ways
Second ball can be selected in 9 ways
Third ball can be selected in 8 ways
Thus, there are 10×9×8 =720 different ways of selecting three balls.
b.
There are three cases that satisfy this condition
- first ball picked is 5, the others are not
- first ball is not 5, second is 5, third is not
- first and second ball is not five, third ball is 5
Each probabilities are:
Thus, one of the balls selected is the number 5 is then
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42 + 37 = 79
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miles !
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42 + 37 = 79
Now we need to add the fractions
To add we need a common denominator.
2 and 5 can both go into 10, so that will be a our common denominator.
Now you have...
which is equal to
add that to the 79 we got earlier ...
The toal and final answer is
Hope I helped and remember to vote this as the brainliest answer ! :)