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I went with "B". Could anyone explain if option "E" is grammatically incorrect?

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E) There is no practical applications for equations involving such imaginary numbers as these ----- there is no practical applications– SV error: it should be - there are no practical applications, since the real subject applications is plural
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The word "these" must be followed by a noun, am I right? In that case the only valid answer would be B.
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Although the square root of a negative number has no real value, it is not necessarily true that equations involving imaginary numbers like these are practically inapplicable

A) equations involving imaginary numbers like these are practically inapplicable

B) equations involving such imaginary numbers have no practical applications

-I eliminated options C, D and E for the following reasons. After eliminating them, I was left with A and B. B is more precise, and clear in meaning than B is.

C) equations involving these inapplicable imaginary numbers are practical

-This option changes the meaning by making the numbers inapplicable, Eliminated

D) equations involving imaginary numbers such as these are inapplicable practically

-Practically inapplicable is much better than inapplicable practically

E) there is no practical applications for equations involving such imaginary numbers as these

- Wordy. "As these" is an unnecessary add-on
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diogoguitarrista
Although the square root of a negative number has no real value, it is not necessarily true that equations involving imaginary numbers like these are practically inapplicable

A) equations involving imaginary numbers like these are practically inapplicable
B) equations involving such imaginary numbers have no practical applications
C) equations involving these inapplicable imaginary numbers are practical
D) equations involving imaginary numbers such as these are inapplicable practically
E) there is no practical applications for equations involving such imaginary numbers as these



source: Kaplan Premier

KAPLAN OFFICIAL EXPLANATION:



Choices (A), (C), (D), and (E) use the plural pronoun these to refer to the singular noun square root. That's not a problem in (B); the phrase such imaginary numbers means "numbers like the one mentioned."
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