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Which of the following is two more than square of an odd integer?

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Which of the following is two more than square of an odd integer?  [#permalink]

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New post 01 Dec 2018, 09:18
1
4
00:00
A
B
C
D
E

Difficulty:

  75% (hard)

Question Stats:

39% (01:54) correct 61% (02:09) wrong based on 44 sessions

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GMATbuster's Weekly Quant Quiz#11 Ques #5


For Questions from earlier quizzes: Click Here


Which of the following is two more than square of an odd integer?

A)14173
B)14361
C)14643
D)14737
E)14981

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Re: Which of the following is two more than square of an odd integer?  [#permalink]

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New post 01 Dec 2018, 09:49
1
1
( odd number )^2 + 2
odd number = 2n+1 ( where n can be any non negative integer )
( 2n +1 ) ^2 +2
4n^2 + 1 + 4n + 2
4( n^2 + n ) + 3 ( This eq implies it leaves remainder 3 when divided by 4)

73 ---------------- leaves r=1
61 ---------------- leaves r=1
43----------------- leaves r=3 correct
37------------------ leaves r=1
81 ----------------- leaves r =1

hence answer is C choice
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Re: Which of the following is two more than square of an odd integer?  [#permalink]

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New post 03 Dec 2018, 05:03
2
I quickly plugged in the closest perfect square (no theory really). 120*120=14400, 121*121=14641 (+2 = C)
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Re: Which of the following is two more than square of an odd integer? &nbs [#permalink] 03 Dec 2018, 05:03
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Which of the following is two more than square of an odd integer?

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