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lemonwatermelo
Joined: 01 Aug 2021
Last visit: 17 Nov 2025
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Concentration: International Business, Strategy
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Schools: Duke '26 HBS '26 HEC Sept '26 INSEAD Aug '26 Kellogg '26 LBS '26 UNC '26 NUS '26 Ross '27 Yale '26
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04 Jul 2025, 06:04
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Question: Can an African grey parrot detect color W, given that they cannot detect colors with wavelengths ≥ 620 nanometers?
To determine: If color W’s wavelength is less than 620 nm
Statement 1:
Color V has a wavelength of 300 nanometers.
• Nothing about color W
• Cannot determine if W is detectable by the parrot.
Not sufficient.
Statement 2:
Wavelength of color W is twice that of color V.
• Don’t know what color V’s wavelength is.
• Cannot determine W’s wavelength.
Not sufficient.
Combine Statements 1 and 2:
- Color V = 300 nm
- Color W = 2 × 300 = 600 nm
600 nm < 620 nm
So the parrot can detect color W.
Therefore, together, the statements are sufficient.
Answer is C (Together the statements are sufficient)
To determine: If color W’s wavelength is less than 620 nm
Statement 1:
Color V has a wavelength of 300 nanometers.
• Nothing about color W
• Cannot determine if W is detectable by the parrot.
Not sufficient.
Statement 2:
Wavelength of color W is twice that of color V.
• Don’t know what color V’s wavelength is.
• Cannot determine W’s wavelength.
Not sufficient.
Combine Statements 1 and 2:
- Color V = 300 nm
- Color W = 2 × 300 = 600 nm
600 nm < 620 nm
So the parrot can detect color W.
Therefore, together, the statements are sufficient.
Answer is C (Together the statements are sufficient)
04 Jul 2025, 06:06
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Bunuel
We know that African grey parrots (hereforth parrots) can detect a color if wavelength >= 620 nm
Using (1) alone,
Color V wavelength = 300 nm
We cannot determine if parrots can detect the color W
Using (2) alone,
Color W wavelength = 2 (Color V wavelength)
Again, with an unknow variable is this equation, we cannot determine if parrots can detect the color W.
Using both together,
Color W wavelength = 2 (Color V wavelength)
W = 2(V)
W = 2(300)
W = 600 nm
We can now say that since color W wavelength is less than 620 nm, the parrots cannot detect this color.
Hence, (C) Both together are sufficient
04 Jul 2025, 06:18
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Somehow i doubt my answer but i will give it a try explaining my logic for choosing (E)
I interpret the stimulus as a conditional statement:
- If the wavelengths greater than or equal to 620 nanometers, African grey parrots cannot detect colors
However, it's a mistaken negation to conclude that if some wavelengths below 620, African grey parrots can detect colors. Why? Because there are other necessary conditions that the wavelength of color W may not have
I interpret the stimulus as a conditional statement:
- If the wavelengths greater than or equal to 620 nanometers, African grey parrots cannot detect colors
However, it's a mistaken negation to conclude that if some wavelengths below 620, African grey parrots can detect colors. Why? Because there are other necessary conditions that the wavelength of color W may not have
.
