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Which of the following must be true?

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Which of the following must be true?  [#permalink]

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New post 13 Oct 2018, 09:09
1
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A
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Question Stats:

39% (01:09) correct 61% (01:10) wrong based on 46 sessions

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Which of the following must be true?
A) A Linear equation in one variable always gives a unique value of x.
B) A Quadratic equation in one variable always gives two unique value of x.
C) \((EVEN)^N\) is always EVEN, Where N is an integer
D)\((ODD)^N\) can never be EVEN, Where N is an integer
E) |x| is always Positive.

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Re: Which of the following must be true?  [#permalink]

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New post 13 Oct 2018, 09:15
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In my opinion (D) should be correct. Please see attached solution.

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Re: Which of the following must be true?  [#permalink]

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New post 13 Oct 2018, 09:30
Which of the following must be true?
A) A Linear equation in one variable always gives a unique value of x.
B) A Quadratic equation in one variable always gives two unique value of x.
C) (EVEN)N(EVEN)N is always EVEN, Where N is an integer
D)(ODD)N(ODD)N can never be EVEN, Where N is an integer
E) |x| is always Positive.

D&E should be right
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Re: Which of the following must be true?  [#permalink]

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New post 13 Oct 2018, 09:37
OA : D

A) A Linear equation in one variable always gives a unique value of x. ==> Can have no solution some times
B) A Quadratic equation in one variable always gives two unique value of x.==> can have x as same values as ==> X^2 -4 = 0 , where x have { 2,2 } values
C) Even ^N is always EVEN, Where N is an integer ==> when n is Zero ==False
D) Odd ^ N is can never be EVEN, Where N is an integer ==> True for all values of N as Odd * Odd is always ODD , True for N = 0 as well , as 3^0 = 1 which is ODD
E) |x| is always Positive ===> false for x = 0
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Re: Which of the following must be true?  [#permalink]

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New post 13 Oct 2018, 09:39
Ans E ( as this is the distance from origin - dirn is not involved)
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Re: Which of the following must be true?  [#permalink]

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New post 13 Oct 2018, 10:00
Answer to question ............................................
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Re: Which of the following must be true?   [#permalink] 13 Oct 2018, 10:00
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