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21 Jun 2022, 14:45
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
94% (01:28) correct
6%
(01:28)
wrong
based on 36
sessions
History
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Time
Result
Not Attempted Yet
A bag contains 21 tickets numbered from 1 to 21. A ticket is drawn and then another ticket is drawn without replacement. What is the probability that both tickets will show even numbers?
A. 2/11
B. 4/19
C. 3/14
D. 5/12
E. 9/11
A. 2/11
B. 4/19
C. 3/14
D. 5/12
E. 9/11
21 Jun 2022, 15:11
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The answer should be C
There are 10 even numbers from 1 to 21.
Probability of getting even on first draw is 10/21
Probability of getting even on second draw is 9/20 (no replacement)
Total probability,
[10/21] × [9/20]
=3/14
Gg...
Posted from my mobile device
There are 10 even numbers from 1 to 21.
Probability of getting even on first draw is 10/21
Probability of getting even on second draw is 9/20 (no replacement)
Total probability,
[10/21] × [9/20]
=3/14
Gg...
Posted from my mobile device
21 Jun 2022, 20:19
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Every time you proceed a subtraction from integers “inclusive” you must add one in the end or you are counting intervals instead integers.
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