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# If x is a positive integer, is x even? (1) The remainder of (x^2-1)/4

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Re: If x is a positive integer, is x even? (1) The remainder of (x^2-1)/4 [#permalink]
1
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Statement 1
(x^2 -1)/4 =0
x^2 -1 = 0
x = +1 or -1
As x is positive integer so x=1
Sufficient
Statement 2
x =1,2,3 or 4
Not sufficient

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Re: If x is a positive integer, is x even? (1) The remainder of (x^2-1)/4 [#permalink]
A)x^2=4n+1
x^2=1,9,25,49..( as x is positive integer)
x=1,3,5,7..
x is odd
Sufficient
B)Not sufficient
1,2,3,4

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Re: If x is a positive integer, is x even? (1) The remainder of (x^2-1)/4 [#permalink]
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