SAT I 一日一问:2013年3月18日

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The Correct answer is B.

Explanation

If b equals 0 and a equals 5, then (absolute value of a) minus (absolute value of b) equals (absolute value of 5) minus (absolute value of 0) equals 5. Hence if (absolute value of a) minus (absolute value of b) equals 5, it could be true that b equals 0.

If (absolute value of a) minus (absolute value of b) equals 5, none of the other four statements could be true:

  •   If a equals 0, then (absolute value of a) minus (absolute value of b) equals 0 minus (absolute value of b) equals negative (absolute value of b). However, since (absolute value of b) is greater than or equal to 0, there is no value of bfor which negative (absolute value of b) equals 5.
  •   If a equals b, then (absolute value of a) minus (absolute value of b) equals (absolute value of a) minus (absolute value of a) equals 0 does not equal 5.
  •   If a equals negative b, then (absolute value of a) minus (absolute value of b) equals (negative absolute value of b) minus (absolute value of b) equals (absolute value of b) minus (absolute value of b) equals 0 does not equal 5.
  •   If a equals 1, then (absolute value of a) minus (absolute value of b) equals (absolute value of 1) minus (absolute value of b) equals 1 minus (absolute value of b). However, since (absolute value of b) is greater than or equal to 0, there is no value of b for which 1 minus (absolute value of b) equals 5.
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