If x is a positive integer, which of the following could NOT be the sq : GMAT Problem Solving (PS)
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# If x is a positive integer, which of the following could NOT be the sq

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If x is a positive integer, which of the following could NOT be the sq [#permalink]

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21 Mar 2011, 21:06
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If x is a positive integer, which of the following could NOT be the square of x?

(A) 5,008,644
(B) 5,004,169
(C) 4,999,696
(D) 4,995,225
(E) 4,990,752
[Reveal] Spoiler: OA
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Re: If x is a positive integer, which of the following could NOT be the sq [#permalink]

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22 Mar 2011, 00:58
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dreambeliever wrote:
If x is a positive integer, which of the following could NOT be the square of x?

(A) 5,008,644
(B) 5,004,169
(C) 4,999,696
(D) 4,995,225
(E) 4,990,752

A number ending with 2 can never be a perfect square.

Units digit of a perfect square must be:
1*1=1
2*2=4
3*3=9
4*4=6
5*5=5
6*6=6
7*7=9
8*8=4
9*9=1

1,4,9,6,5

Ans: "E"
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Re: If x is a positive integer, which of the following could NOT be the sq [#permalink]

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22 Mar 2011, 02:16
The answer is E; reasoning is same as suggested by fluke.
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Kudos [?]: 76 [0], given: 7

Re: If x is a positive integer, which of the following could NOT be the sq [#permalink]

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22 Mar 2011, 07:32
OA is E.

Posted from my mobile device
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Re: If x is a positive integer, which of the following could NOT be the sq [#permalink]

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22 Mar 2011, 22:31
Answer is E , just to add: Fluke missed a 0 in his list(more precisely, a double zero)
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Re: If x is a positive integer, which of the following could NOT be the sq [#permalink]

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20 Apr 2011, 15:33

unit digit of a perfect square integer has to be 0,1,4,9,6,5 and the digit thats ending with 2 can never be a perfect square.
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Re: If x is a positive integer, which of the following could NOT be the sq [#permalink]

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30 May 2016, 03:53
Hello from the GMAT Club BumpBot!

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Re: If x is a positive integer, which of the following could NOT be the sq [#permalink]

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30 May 2016, 03:57
dreambeliever wrote:
If x is a positive integer, which of the following could NOT be the square of x?

(A) 5,008,644
(B) 5,004,169
(C) 4,999,696
(D) 4,995,225
(E) 4,990,752

A perfect square will never end in 2, 3, 7 or 8. (last digit cannot be 2, 3, 7 or 8)

Here E is the odd one out.

Re: If x is a positive integer, which of the following could NOT be the sq   [#permalink] 30 May 2016, 03:57
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