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AP EAMCET Engineering 17 Sep 2020 Shift 2 Paper
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© examsnet.com
Question : 61
Total: 160
A box contains
4
defective and
6
good machines. Two machines are selected at random without replacement. Find the probability that both the machines are good.
1
2
1
3
1
4
1
5
Validate
Solution:
Box contains 4 defective and 6 good machines.
∴ Total number of machines
=
10
Probability that first machine selected is good
=
Number of good
m
/
c
Total number of
m
/
c
=
6
10
Probability that second machine is good
=
5
9
Probability that both machines are good
=
6
10
×
5
9
=
1
3
© examsnet.com
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