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If P and Q are integers, is [m][fraction](10^{2P} + Q)/3[/fraction][/m

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If P and Q are integers, is [m][fraction](10^{2P} + Q)/3[/fraction][/m  [#permalink]

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New post 20 Oct 2018, 09:04
1
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A
B
C
D
E

Difficulty:

  65% (hard)

Question Stats:

38% (00:54) correct 62% (00:52) wrong based on 37 sessions

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If P and Q are integers, is \(\frac{(10^{2P} + Q)}{3}\) an integer?
(1) Q = 5
(2) P*Q is even

GMATbuster's Weekly GMAT Quant Quiz #5 Ques No 2


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Re: If P and Q are integers, is [m][fraction](10^{2P} + Q)/3[/fraction][/m  [#permalink]

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New post 20 Oct 2018, 10:29
If P and Q are integers, is (102P+Q)/3 is an integer

an integer?
(1) Q = 5
(2) P*Q is

Option A : Q= 5, so term is (10^2P +5)/3...now if we have P=0 or P be any integer >0,
(10^2P +5)/3 will be an integer
Illustration: if P=0, (1+5)/3 = 2
or if P=1, 100+5/3= 105/3= 35

but what if P is negative , if P=-1 it becomes (1/100+ 5)/3, which is not an integer

hence A is not sufficient

Option B: P *Q is even
which means P is even Q is even
P is odd, Q is even
P is even and Q is odd

so lets say 10^2+4/3= 104/3 , not an integer
but 10^2+5= 35 an integer
so B is not sufficient

Lets take both ,
Q=5 and P needs to be even
if P>0, then expression is definitely an integer as we discussed in Option A explanation
but if P becomes negative , lets take P= -2
so it becomes 1/10000 +5/3 which is not an integer...so even together cant solve the question

Hence E is the answer
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Re: If P and Q are integers, is [m][fraction](10^{2P} + Q)/3[/fraction][/m  [#permalink]

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New post 20 Oct 2018, 09:08
A:
We don't need to know the value of P so statement 1 is sufficient. regardless the numerator will be 10...05 and the property for if a number is divisible by 3 is to add the digits. so 1+5 = 6, thus it is an integer

Statement 2 doesn't give us a value for Q so its insufficient
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Re: If P and Q are integers, is [m][fraction](10^{2P} + Q)/3[/fraction][/m  [#permalink]

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New post 20 Oct 2018, 09:11
Stat 1 -

P =0 Q = 5
Ans 2
P=-1 Q=5
Ans 0.01+5 / 3

NS

Stm 2
P*Q even - either P is even or Q is even - NS

combined
P is even but if its 2 then int and if -2 then not

so answer is E
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Re: If P and Q are integers, is [m][fraction](10^{2P} + Q)/3[/fraction][/m  [#permalink]

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New post 20 Oct 2018, 09:12
A.

We are not worried about the value of P, only Q. The first provides value of Q for which answer can be confirmed Yes as per divisibility rule of 3.
The second statement mentions the following:
P is even, Q is even
Or
P is even, Q is odd
Or
P is odd, Q is even
There are cases (q=5 or q=6) for which we get both confirmed Yes and No. Thus, not sufficient.
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Re: If P and Q are integers, is [m][fraction](10^{2P} + Q)/3[/fraction][/m  [#permalink]

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New post Updated on: 20 Oct 2018, 11:00
Statement 1:
Q = 5 --> remainder = 2
When \(10^2p\) divided by 3
+ if p= 0, \(10^2p\) leave remainder =0
+ if p>0, always leaves remainder = 1
+ if p<0, this fraction does not divisible by 3

--> Insufficient

Statement 2:

PQ Even. It is undecided whether \(10^(2P)\) and Q is even or odd, this leave different remainders when The fraction is divided by 3

--> Insufficient

Combine 2 statements, Q is 5 and PQ is even. This means P must be even.

From analysis in Statement 1 above , P is even and P>0 then we have
--> \(\frac{(10^(2P)+Q)}{3}\) is divisible by 3

—> Sufficient

Hence, Choice C

Originally posted by yenbh on 20 Oct 2018, 09:12.
Last edited by yenbh on 20 Oct 2018, 11:00, edited 2 times in total.
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Re: If P and Q are integers, is [m][fraction](10^{2P} + Q)/3[/fraction][/m  [#permalink]

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New post 20 Oct 2018, 12:39
A

To be divisible by 3, the sum of all the numbers should be divisible by 3

A)The sum of all the digits in the first number is 1 whatever be P.Also +5 implies 1+5=6 irrespective of whatever is P.SUFFICIENT.

B)P*Q is even.One case is p is even q is odd.Not always divisible by 3.INSUFFICIENT.
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Re: If P and Q are integers, is [m][fraction](10^{2P} + Q)/3[/fraction][/m &nbs [#permalink] 20 Oct 2018, 12:39
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