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If k and t are integers and k^2 – t^2 is an odd integer 02 Oct 2007, 13:27
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If k and t are integers and k^2 – t^2 is an odd integer, which of the following must be an even integer?

I. k + t + 2
II. k^2 + 2kt + t^2
III. k^2 + t^2

A. None
B. I only
C. II only
D. III only
E. I, II, and III
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Official Answer
A
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If k and t are integers and k^2 – t^2 is an odd integer 02 Oct 2007, 13:33
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avenger
Q25)
If k and t are integers and k^2 – t^2 is an odd integer, which of the following must be an even integer?

I. k + t + 2
II. k^2 + 2kt + t^2
III. k^2 + t^2

(a) None
(b) I only
(c) II only
(d) III only
(e) I, II, and III
Show more


For k^2 – t^2 to be odd , I guess either k or t must be odd .
So lets assume k= even t = odd

I. k + t + 2
even + odd + 2 = even + odd = odd

II. k^2 + 2kt + t^2
even + even + odd = even + odd = odd

III. k^2 + t^2
even + odd = odd .

So I guess NONE
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If k and t are integers and k^2 – t^2 is an odd integer 02 Oct 2007, 13:41
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none..i.e E

take any example.. 3 & 4 and plug it in each option.
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If k and t are integers and k^2 – t^2 is an odd integer 02 Oct 2007, 15:45
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OA is A i.e. (None).

Thanks
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If k and t are integers and k^2 – t^2 is an odd integer 07 May 2012, 08:42
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avenger
Q25)
If k and t are integers and k^2 – t^2 is an odd integer, which of the following must be an even integer?

I. k + t + 2
II. k^2 + 2kt + t^2
III. k^2 + t^2

(a) None
(b) I only
(c) II only
(d) III only
(e) I, II, and III
Show more

I have a doubt regarding option(III) of the stem,below is my explanation:
Given : K^2-t^2--> odd
it means (k+t)(k-t) both are odd.
take option 3 we have to chek whether k^2+t^2 is odd or even.
k^2+t^2=(k+t)^2-(k-t)^2
= k^2+t^2+2kt-k^2-t^2+2kt
=4kt
Here as 4 is an even number, and any odd number multiplied by an even results in an even number.

Please let me know whether this is correct as i had interpreted or not. and provide a suitable explanation.
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If k and t are integers and k^2 – t^2 is an odd integer 07 May 2012, 09:23
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Q25)
If k and t are integers and k^2 – t^2 is an odd integer, which of the following must be an even integer?

I. k + t + 2
II. k^2 + 2kt + t^2
III. k^2 + t^2

(a) None
(b) I only
(c) II only
(d) III only
(e) I, II, and III

I have a doubt regarding option(III) of the stem,below is my explanation:
Given : K^2-t^2--> odd
it means (k+t)(k-t) both are odd.
take option 3 we have to chek whether k^2+t^2 is odd or even.
k^2+t^2=(k+t)^2-(k-t)^2
= k^2+t^2+2kt-k^2-t^2+2kt
=4kt
Here as 4 is an even number, and any odd number multiplied by an even results in an even number.

Please let me know whether this is correct as i had interpreted or not. and provide a suitable explanation.
Show more

The red part is not correct. k^2+t^2 does not equal to 4kt.

If k and t are integers and k^2 – t^2 is an odd integer, which of the following must be an even integer?

I. k + t + 2
II. k^2 + 2kt + t^2
III. k^2 + t^2

A. None
B. I only
C. II only
D. III only
E. I, II, and III

k^2–t^2 is an odd integer means that either k is even and t is odd or k is odd and t is even.

Check all options:
I. k + t + 2 --> even+odd+even=odd or odd+even+even=odd. Discard;
II. k^2 + 2kt + t^2 --> even+even+odd=odd or odd+even+even=odd. Discard;
III. k^2 + t^2 --> even+odd=odd or odd+even=odd. Discard.

Answer: A.
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If k and t are integers and k^2 – t^2 is an odd integer 07 May 2012, 10:54
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Bunuel
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Q25)
If k and t are integers and k^2 – t^2 is an odd integer, which of the following must be an even integer?

I. k + t + 2
II. k^2 + 2kt + t^2
III. k^2 + t^2

(a) None
(b) I only
(c) II only
(d) III only
(e) I, II, and III

I have a doubt regarding option(III) of the stem,below is my explanation:
Given : K^2-t^2--> odd
it means (k+t)(k-t) both are odd.
take option 3 we have to chek whether k^2+t^2 is odd or even.
k^2+t^2=(k+t)^2-(k-t)^2
= k^2+t^2+2kt-k^2-t^2+2kt
=4kt
Here as 4 is an even number, and any odd number multiplied by an even results in an even number.

Please let me know whether this is correct as i had interpreted or not. and provide a suitable explanation.

The red part is not correct. k^2+t^2 does not equal to 4kt.

If k and t are integers and k^2 – t^2 is an odd integer, which of the following must be an even integer?

I. k + t + 2
II. k^2 + 2kt + t^2
III. k^2 + t^2

A. None
B. I only
C. II only
D. III only
E. I, II, and III

k^2–t^2 is an odd integer means that either k is even and t is odd or k is odd and t is even.

Check all options:
I. k + t + 2 --> even+odd+even=odd or odd+even+even=odd. Discard;
II. k^2 + 2kt + t^2 --> even+even+odd=odd or odd+even+even=odd. Discard;
III. k^2 + t^2 --> even+odd=odd or odd+even=odd. Discard.

Answer: A.
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Thanks, i misinterpreted the option (III),rather i solved it for k^2 - t^2.
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If k and t are integers and k^2 – t^2 is an odd integer 27 Mar 2013, 04:51
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i have chosen to solve using fact that since k^2 - t^2 is odd, both K+T and K-T should be odd.
Making this choice, i get that both options 1 and 2 are odd
1) k+t+2 means odd number + 2 = odd number
2) (k+t)^2 means (odd)^2 = odd number
3) k^2 + t^2 = ((k+t)^2 + (k-t)^2)/2 => (odd + odd)/2 = even

so, result is (1) and (2) are odd while (3) is even, since this combination is not part of any answer, chose NONE.

Is this approach correct?
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If k and t are integers and k^2 – t^2 is an odd integer 27 Mar 2013, 06:36
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mamathak
i have chosen to solve using fact that since k^2 - t^2 is odd, both K+T and K-T should be odd.
Making this choice, i get that both options 1 and 2 are odd
1) k+t+2 means odd number + 2 = odd number
2) (k+t)^2 means (odd)^2 = odd number
3) k^2 + t^2 = ((k+t)^2 + (k-t)^2)/2 => (odd + odd)/2 = even

so, result is (1) and (2) are odd while (3) is even, since this combination is not part of any answer, chose NONE.

Is this approach correct?
Show more

No, that's NOT correct.

k^2–t^2 is an odd integer means that either k is even and t is odd or k is odd and t is even.

Check here: if-k-and-t-are-integers-and-k-2-t-2-is-an-odd-integer-53248.html#p1082758

Hope it helps.
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If k and t are integers and k^2 – t^2 is an odd integer 27 Mar 2013, 06:50
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If k and t are integers and k^2 – t^2 is an odd integer, which of the following must be an even integer?

I. k + t + 2
II. k^2 + 2kt + t^2
III. k^2 + t^2

A. None
B. I only
C. II only
D. III only
E. I, II, and III

k^2 -t^2 = odd
so,if k is even,t will be odd.

I. k+t+2 = even+odd+2 = odd
II. k^2 + 2kt+t^2 = even + even + odd = odd
III. k^2 + t^2 = even + odd = odd

Hence answer will be option A.
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If k and t are integers and k^2 – t^2 is an odd integer 27 Mar 2013, 08:28
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This problem mobilizes addition, substraction and multiplication rules of odd and even integers so knowing your rules will be the key to helping you solve this correctly. :)

First of all, \(k^2 - t^2\) can be rewritten as \((k-t)*(k+t)\)

If you're unsure about the notation, just develop \((k-t)*(k+t)\).

Now, assuming that \(k^2 - t^2\) = \((k-t)*(k+t)\) is odd, then according to the following rule :

odd * odd = odd (1)

We'll get \(k-t\) is odd and \(k+t\) is odd, which is extremely helpful since, if you notice the answer choices, all of them revolve around \(k+t\). So let's go through them one by one :

I. \(k+t+2\).

Using parenthesis to isolate \(k+t\), we get \((k+t)+2\) which is a sum involving an odd number and an even number. So, according to the following rule :

odd + even = odd (2)

Which means that \(k+t+2\) is odd. So answer I is not possible. (Since we're looking for an even result)

II. \(k^2 + 2kt + t^2\)

Now this answer choice may seem intimidating, but it actually isn't. Since \(k^2 + 2kt + t^2\) is equal to \((k+t)^2\). And since \(k+t\) is odd, then its square will be odd as well (rule 1). So answer II is also not possible.

III.\(k^2 + t^2\)

Once again, this answer choice may seem intimidating since you have no data on k nor t. But, looking at answer choice II., \(k^2+t^2\) is actually equal to \((k+t)^2 - 2kt\).
This is a difference between an odd number \((k+t)^2\) and an even number \(2kt\), so according to rule 2, the result will be odd. So answer III. is also not possible.

As such, the only correct answer to this question is answer A.

Hope that helped. :)
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If k and t are integers and k^2 – t^2 is an odd integer 04 Sep 2013, 04:18
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Bunuel
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Q25)
If k and t are integers and k^2 – t^2 is an odd integer, which of the following must be an even integer?

I. k + t + 2
II. k^2 + 2kt + t^2
III. k^2 + t^2

(a) None
(b) I only
(c) II only
(d) III only
(e) I, II, and III

I have a doubt regarding option(III) of the stem,below is my explanation:
Given : K^2-t^2--> odd
it means (k+t)(k-t) both are odd.
take option 3 we have to chek whether k^2+t^2 is odd or even.
k^2+t^2=(k+t)^2-(k-t)^2
= k^2+t^2+2kt-k^2-t^2+2kt
=4kt
Here as 4 is an even number, and any odd number multiplied by an even results in an even number.

Please let me know whether this is correct as i had interpreted or not. and provide a suitable explanation.

The red part is not correct. k^2+t^2 does not equal to 4kt.

If k and t are integers and k^2 – t^2 is an odd integer, which of the following must be an even integer?

I. k + t + 2
II. k^2 + 2kt + t^2
III. k^2 + t^2

A. None
B. I only
C. II only
D. III only
E. I, II, and III

k^2–t^2 is an odd integer means that either k is even and t is odd or k is odd and t is even.

Check all options:
I. k + t + 2 --> even+odd+even=odd or odd+even+even=odd. Discard;
II. k^2 + 2kt + t^2 --> even+even+odd=odd or odd+even+even=odd. Discard;
III. k^2 + t^2 --> even+odd=odd or odd+even=odd. Discard.

Answer: A.
Show more

Hi Bunuel,
You've mentioned that if k^2–t^2 is an odd integer means that either k is even and t is odd or k is odd and t is even.

Isn't a 3rd case also possible where K is odd and T is 0?
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If k and t are integers and k^2 – t^2 is an odd integer 04 Sep 2013, 04:26
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Bunuel
piyushksharma

If k and t are integers and k^2 – t^2 is an odd integer, which of the following must be an even integer?

I. k + t + 2
II. k^2 + 2kt + t^2
III. k^2 + t^2

(a) None
(b) I only
(c) II only
(d) III only
(e) I, II, and III

I have a doubt regarding option(III) of the stem,below is my explanation:
Given : K^2-t^2--> odd
it means (k+t)(k-t) both are odd.
take option 3 we have to chek whether k^2+t^2 is odd or even.
k^2+t^2=(k+t)^2-(k-t)^2
= k^2+t^2+2kt-k^2-t^2+2kt
=4kt
Here as 4 is an even number, and any odd number multiplied by an even results in an even number.

Please let me know whether this is correct as i had interpreted or not. and provide a suitable explanation.

The red part is not correct. k^2+t^2 does not equal to 4kt.

If k and t are integers and k^2 – t^2 is an odd integer, which of the following must be an even integer?

I. k + t + 2
II. k^2 + 2kt + t^2
III. k^2 + t^2

A. None
B. I only
C. II only
D. III only
E. I, II, and III

k^2–t^2 is an odd integer means that either k is even and t is odd or k is odd and t is even.

Check all options:
I. k + t + 2 --> even+odd+even=odd or odd+even+even=odd. Discard;
II. k^2 + 2kt + t^2 --> even+even+odd=odd or odd+even+even=odd. Discard;
III. k^2 + t^2 --> even+odd=odd or odd+even=odd. Discard.

Answer: A.

Hi Bunuel,
You've mentioned that if k^2–t^2 is an odd integer means that either k is even and t is odd or k is odd and t is even.

Isn't a 3rd case also possible where K is odd and T is 0?
Show more

Well, since 0 is an even number, then this scenario falls into the case when k=odd and t=even.
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If k and t are integers and k^2 – t^2 is an odd integer 08 Sep 2013, 00:50
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Thank you, Bunuel.
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If k and t are integers and k^2 – t^2 is an odd integer 21 Oct 2016, 11:29
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avenger
If k and t are integers and k^2 – t^2 is an odd integer, which of the following must be an even integer?

I. k + t + 2
II. k^2 + 2kt + t^2
III. k^2 + t^2

A. None
B. I only
C. II only
D. III only
E. I, II, and III
Show more

Plug in some no's and check

k = 7 , t = 4

I. k + t + 2 = 7 + 4 + 2 = 13 ( Odd )
II. k^2 + 2kt + t^2 = 7^2 + 2*7*4 + 4^2 = 121 ( Odd )
III. k^2 + t^2 = 7^2 + 4^2 = 65 ( Odd )

k = 6 , t = 3

I. k + t + 2 = 6 + 3 + 2 = 11 ( Odd )
II. k^2 + 2kt + t^2 = 6^2 + 2*6*3 + 3^2 = 81 ( Odd )
III. k^2 + t^2 = 6^2 + 3^2 = 45 ( Odd )

Check in all the cases the answer will be ODD, hence we will not get even number..

Answer will be (A) None...
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If k and t are integers and k^2 – t^2 is an odd integer 07 Nov 2016, 05:06
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avenger
If k and t are integers and k^2 – t^2 is an odd integer, which of the following must be an even integer?

I. k + t + 2
II. k^2 + 2kt + t^2
III. k^2 + t^2

A. None
B. I only
C. II only
D. III only
E. I, II, and III
Show more

Here is a methodical approach to solve this question:

Given Info:
\(k^2 – t^2\) is odd.

Inferences:
\(k^2 – t^2\) can be written as \((k – t)*(k + t)\)
Since the product is odd, both \((k – t)\) and \((k + t)\) must be odd.

So, \((k – t)\) is odd ……. (1)
\((k + t)\) is odd …… (2)

The above also implies that exactly one of {\(k\), \(t\)} is odd and the other is even …… (3)


Approach:
We’ll use the above inferences to identify the even-odd nature of each of the given expressions.

Working Out:

(I) \(k + t + 2\)
We already determined that \((k + t)\)is odd.
So, adding an even number (\(2\)) to \((k + t)\) won’t change its even-odd nature.

Think: \(3\)is odd. \(3+2 = 5\) is also odd.

(II) \(k^2 + 2kt + t^2\)
This is simply \((k + t)^2\)

Since \((k + t)\) is odd, its square is also odd.

Think: \(3\) is odd. \(3^2 = 9\) is odd).

(You can also look at this case as: product of two odd integers is always odd).

(III) \(k^2 + t^2\)

\(k^2 + t^2\) will have the same even-odd nature as\(k^2 – t^2\).
So, \(k^2 + t^2\) is also odd.

Think: \((a + b)\) will have the same even-odd nature as\((a – b)\).
Eg: \(5-2 = 3\) (odd) \(5 + 2 = 7\) (odd)

Since none of the given expressions are even, the correct answer is option A.

Hope this helps. :)

Cheers,
Krishna
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If k and t are integers and k^2 – t^2 is an odd integer 03 Sep 2018, 19:00
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avenger
If k and t are integers and k^2 – t^2 is an odd integer, which of the following must be an even integer?

I. k + t + 2
II. k^2 + 2kt + t^2
III. k^2 + t^2

A. None
B. I only
C. II only
D. III only
E. I, II, and III
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We can see that k^2 - t^2 = odd or (k - t)(k + t) = odd. Thus, (k - t) is odd, and (k + t) is odd.

Let’s consider each Roman numeral.

I. Since(k + t) is odd, k + t + 2 = odd + 2 = odd.

II. Since k^2 + 2kt + t^2 = (k + t)^2 = (odd)^2 = odd, k^2 + 2kt + t^2 is odd.

III. Since k^2 – t^2 is odd, k^2 + t^2 is also odd.

Answer: A
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If k and t are integers and k^2 – t^2 is an odd integer 16 Jun 2024, 06:43
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