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Are a and b both integers?

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Tuck School Moderator
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Are a and b both integers?  [#permalink]

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New post 18 Feb 2019, 08:17
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

58% (01:29) correct 42% (01:22) wrong based on 38 sessions

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Are a and b both integers?

(1) \(a^2 + b^2\) is an integer.

(2)\(\frac{a}{b}\) is an integer.

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Re: Are a and b both integers?  [#permalink]

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New post 18 Feb 2019, 08:35
PeepalTree wrote:
Are a and b both integers?

(1) \(a^2 + b^2\) is an integer.

(2)\(\frac{a}{b}\) is an integer.


IMO E

so we have a and b, which can be equal, +ive, -ive, irrational numbers, rational numbers.

from 1) a = b =\(\sqrt{2}\)
or a = b = 2

Now 2 + 2 = I, question is answered with a No

Now 4+4 = I, question is answered with a Yes

We can use the same test cases to negate B

Even when we combine both the statements, we can get 2 values

Therefore answer

E
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Are a and b both integers?  [#permalink]

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New post 18 Feb 2019, 17:57
St 1:
\((\sqrt{2})^2 + (\sqrt{3})^2 = 5\); a & b are non integers
\((2)^2 + (3)^2 = 5\); a & b are integers
NOT SUFFICIENT

St 2:
\(2.5/2.5 = 1\); a & b are non integers
\(6/3 = 2\); a & b are integers
NOT SUFFICIENT

St 1 & St 2:
Same as above

(E)
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Are a and b both integers?   [#permalink] 18 Feb 2019, 17:57
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