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Math Revolution GMAT Instructor
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For a,b,d are the positive integers, and da means that “a is divisibl
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11 Feb 2016, 23:02
Question Stats:
76% (01:30) correct 24% (01:39) wrong based on 96 sessions
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For a,b,d are the positive integers, and da means that “a is divisible by d”, if dab, which of the following must be true? A. da B. db C. d2ab D. d(a+b) E. d(ab) * A solution will be posted in two days.
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Re: For a,b,d are the positive integers, and da means that “a is divisibl
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12 Feb 2016, 00:56
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.



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Re: For a,b,d are the positive integers, and da means that “a is divisibl
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13 Feb 2016, 22:38
For a,b,d are the positive integers, and da means that “a is divisible by d”, if dab, which of the following must be true? A. da B. db C. d2ab D. d(a+b) E. d(ab) > dab is ab=dk(k=integer) and also 2ab=2dk can be divided by d. Therefore, the answer is C.
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Re: For a,b,d are the positive integers, and da means that “a is divisibl
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04 Mar 2016, 17:26
HI MathRevolution, MathRevolution wrote: For a,b,d are the positive integers, and da means that “a is divisible by d”, if dab, which of the following must be true?
A. da B. db C. d2ab D. d(a+b) E. d(ab)
> dab is ab=dk(k=integer) and also 2ab=2dk can be divided by d. Therefore, the answer is C. d/ab = k => dk = ab. I dont know how could you give conclusion that ab= dk?



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Re: For a,b,d are the positive integers, and da means that “a is divisibl
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07 Mar 2016, 16:34
oanhnguyen1116 wrote: HI MathRevolution, MathRevolution wrote: For a,b,d are the positive integers, and da means that “a is divisible by d”, if dab, which of the following must be true?
A. da B. db C. d2ab D. d(a+b) E. d(ab)
> dab is ab=dk(k=integer) and also 2ab=2dk can be divided by d. Therefore, the answer is C. d/ab = k => dk = ab. I dont know how could you give conclusion that ab= dk? > Because ab is divisible by d.
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Re: For a,b,d are the positive integers, and da means that “a is divisibl
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08 Mar 2016, 00:26



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Re: For a,b,d are the positive integers, and da means that “a is divisibl
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14 Mar 2016, 05:55
Nice question.. Here as AB/D = integer hence 2AB/D = integer Hence C
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Re: For a,b,d are the positive integers, and da means that “a is divisibl
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26 Dec 2018, 11:17
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Re: For a,b,d are the positive integers, and da means that “a is divisibl
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