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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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New post 21 Mar 2011, 22:06
2
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A
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E

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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
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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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New post 22 Mar 2011, 01:58
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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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New post 22 Mar 2011, 03:16
The answer is E; reasoning is same as suggested by fluke.
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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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New post 22 Mar 2011, 23:31
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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New post 20 Apr 2011, 16:33
Answer is E.

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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New post 30 May 2016, 04:57
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.

Answer: 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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New post 13 Aug 2018, 08:01
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Re: If x is a positive integer, which of the following could NOT be the sq   [#permalink] 13 Aug 2018, 08:01
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