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Question

If n is a positive integer and k=5.1×10n, what is the value of k?
(1) 6,000<k<500,000
(2) k2=2.601×109

A
Statement (1) alone is sufficient, but statement (2) alone is not sufficient.
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B
Statement (2) alone is sufficient, but statement (1) alone is not sufficient.
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C
Both statements together are sufficient, but neither statement alone is sufficient.
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D
Each statement alone is sufficient.
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E
Statements (1) and (2) together are not sufficient.
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Solution

The correct option is D Each statement alone is sufficient.
Given that , where n is a positive integer, then the value of k must follow the pattern shown in the table.
  1. Given that 6000 < k < 500000, then k must have the value 51,000, and so n = 4; SUFFICIENT.
  2. Given that , then = 51000, and so n = 4; SUFFICIENT.
  • The correct answer is D; each statement alone is sufficient

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