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If x, y and z are positive single-digit integers and x^y = z. What is

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If x, y and z are positive single-digit integers and x^y = z. What is [#permalink]

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New post 19 Sep 2017, 02:16
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A
B
C
D
E

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  55% (hard)

Question Stats:

44% (00:55) correct 56% (00:47) wrong based on 25 sessions

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If x, y and z are positive single-digit integers and \(x^y = z\). What is z?

(1) x and y even numbers
(2) x = y
[Reveal] Spoiler: OA

Kudos [?]: 85 [0], given: 65

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Re: If x, y and z are positive single-digit integers and x^y = z. What is [#permalink]

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New post 19 Sep 2017, 02:20
Option D

Based on statement 1 we can deduce x and y are 2.
Based on statement 2 we can conclude x and y are 2


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Re: If x, y and z are positive single-digit integers and x^y = z. What is [#permalink]

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New post 19 Sep 2017, 02:52
Nikkb wrote:
If x, y and z are positive single-digit integers and \(x^y = z\) . What is z?

(1) x and y even numbers
(2) x = y


Nikkb , I chose C because I thought that statement A is not sufficient,

\(Z\) can be 1 if \(x=4\) and \(y=0\)
\(Z\) can be 4 if \(x=2\) and \(y=2\).

Wdyt?

This one exploits our knowledge about an even and positive number. Is 0 positive even integer?
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Kudos [?]: 47 [0], given: 206

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Re: If x, y and z are positive single-digit integers and x^y = z. What is [#permalink]

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New post 19 Sep 2017, 02:56
septwibowo wrote:
Nikkb wrote:
If x, y and z are positive single-digit integers and \(x^y = z\) . What is z?

(1) x and y even numbers
(2) x = y


Nikkb , I chose C because I thought that statement A is not sufficient,

\(Z\) can be 1 if \(x=4\) and \(y=0\)
\(Z\) can be 4 if \(x=2\) and \(y=2\).

Wdyt?

This one exploits our knowledge about an even and positive number. Is 0 positive even integer?

−3 < −2 < −1 < 0 < 1 < 2 < 3 < … An integer is positive if it is greater than zero and negative if it is less than zero. Zero is defined as neither negative nor positive.


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Kudos [?]: 21 [0], given: 72

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Re: If x, y and z are positive single-digit integers and x^y = z. What is [#permalink]

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New post 19 Sep 2017, 03:58
septwibowo wrote:
Nikkb wrote:
If x, y and z are positive single-digit integers and \(x^y = z\) . What is z?

(1) x and y even numbers
(2) x = y


Nikkb , I chose C because I thought that statement A is not sufficient,

\(Z\) can be 1 if \(x=4\) and \(y=0\)
\(Z\) can be 4 if \(x=2\) and \(y=2\).

Wdyt?

This one exploits our knowledge about an even and positive number. Is 0 positive even integer?


Generally below 4 terms are used in question stem:

Positive number x => \(x>0\) =>All Numbers more than 0 but not equal to 0
Non-Negative number x => \(x\geq{0}\) =>All Numbers above 0 or equal to 0.
Negative number x => \(x<0\) =>All Numbers less than 0 but not equal to 0
Non-Positive number x => \(x\leq{0}\) =>All Numbers less than 0 or equal to 0.

even integers : ... -4,-2,0,2,4, ......
odd integers : ... -3,-1,1,3,......


So 0 is considered even integer but its neither positive nor negative.


Above question talks about "positive single digit integer" => Integers can be 1,2,3...,9 ... Value of integer cannot be equal to 0 here.

Hope this helps :)

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Re: If x, y and z are positive single-digit integers and x^y = z. What is [#permalink]

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New post 19 Sep 2017, 04:12
Nikkb wrote:
If x, y and z are positive single-digit integers and \(x^y = z\). What is z?

(1) x and y even numbers
(2) x = y



Hi...

x,y, and z are +ive single digits..

Let's see the statements
1) X and y are even numbers..
\(x^y=z\)..
So X and y can take values 2,4,6 or 8..
But z will be single digit when X and y are 2 each..
So z=2^2=4
Sufficient

2) x=y
Following possibilities..
\(1^2, 2^1, 2^2, 2^3, 3^1, 3^2,...\)
So z can be anything from 1 to 9
Insufficient

A
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Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html

Kudos [?]: 5888 [0], given: 118

Re: If x, y and z are positive single-digit integers and x^y = z. What is   [#permalink] 19 Sep 2017, 04:12
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