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11 Feb 2016, 23:02
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Difficulty:
15%
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Question Stats:
79% (01:26) correct
21%
(01:34)
wrong
based on 132
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For a,b,d are the positive integers, and d|a means that “a is divisible by d”, if d|ab, which of the following must be true?
A. d|a
B. d|b
C. d|2ab
D. d|(a+b)
E. d|(a-b)
* A solution will be posted in two days.
A. d|a
B. d|b
C. d|2ab
D. d|(a+b)
E. d|(a-b)
* A solution will be posted in two days.
12 Feb 2016, 00:56
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d/a means a is divisible by d
d/ab means ab divisible by d.
all are integers so ,
if ab is divisible by d,
1 a can be divisible by d
or
2 b can be divisble by d.
so the question stem asks must true.
so option a and b are could but not must.
option c is 2ab divisible by d. if ab is divisible by d then 2ab is divisible by d.
option d and e we can't predict.
so option C is correct.
d/ab means ab divisible by d.
all are integers so ,
if ab is divisible by d,
1 a can be divisible by d
or
2 b can be divisble by d.
so the question stem asks must true.
so option a and b are could but not must.
option c is 2ab divisible by d. if ab is divisible by d then 2ab is divisible by d.
option d and e we can't predict.
so option C is correct.
13 Feb 2016, 22:38
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For a,b,d are the positive integers, and d|a means that “a is divisible by d”, if d|ab, which of the following must be true?
A. d|a
B. d|b
C. d|2ab
D. d|(a+b)
E. d|(a-b)
--> d|ab is ab=dk(k=integer) and also 2ab=2dk can be divided by d.
Therefore, the answer is C.
A. d|a
B. d|b
C. d|2ab
D. d|(a+b)
E. d|(a-b)
--> d|ab is ab=dk(k=integer) and also 2ab=2dk can be divided by d.
Therefore, the answer is C.
