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25 Jun 2022, 08:45
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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:
25%
(medium)
Question Stats:
70% (01:05) correct
30%
(01:11)
wrong
based on 56
sessions
History
Date
Time
Result
Not Attempted Yet
The probability that a certain variety of plant produces a yellow flower is 1/5. If two such plants are selected at random, what is the probability that at least one produces a yellow flower?
(A) 1/25
(B) 8/25
(C) 9/25
(D) 16/25
(E) 17/25
(A) 1/25
(B) 8/25
(C) 9/25
(D) 16/25
(E) 17/25
25 Jun 2022, 09:10
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Bunuel
We could find YY, YX, and XY...or we could find 1-XX. A common mistake in going this route is coming up with the idea to use the 1-minus technique, doing all the math right, finding the probability of XX,...and then forgetting to subtract from 1...
As soon as I see that there's going to be some little step at the end, I flip my computer mouse over. That way, when I go to click an answer choice, the upside down mouse serves as a reminder to make sure I did that last little step. Okay on to the math. What's the probability of XX?
(4/5)(4/5) = 16/25
1-(16/25) = 9/25
Answer choice C.
25 Jun 2022, 15:13
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Again the technique of attacking what the author doesn’t want appears.
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