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27 Jun 2005, 21:00
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For any number n, which of the following cannot be zero?
A. n^5 + 1
B. (2n + 1)/(2n-1)
C. sqrt(4n+1)
D. n^2 + 1
E. n(n+1)/2
A. n^5 + 1
B. (2n + 1)/(2n-1)
C. sqrt(4n+1)
D. n^2 + 1
E. n(n+1)/2
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28 Jun 2005, 15:10
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Answer is D. Even if the number is negative, the square will make it positive. In other words, the n component will never be negative.
In all other choices,
A. if n = -1, then answer = 0
B. n = -0.5, then answer = 0
C. if n = -0.25, answer is 0
E. if n = -1, answer is 0
In all other choices,
A. if n = -1, then answer = 0
B. n = -0.5, then answer = 0
C. if n = -0.25, answer is 0
E. if n = -1, answer is 0
