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number prop

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Intern
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number prop [#permalink] New post 27 Oct 2009, 14:58
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A
B
C
D
E

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  5% (low)

Question Stats:

66% (01:42) correct 33% (01:10) wrong based on 3 sessions
which of the following CANNOT be the greatest common divisor of two positive integers x and y ?

A 1
B x
C y
D x-y
E x+y


Do you assume a random value of x and y for this ?
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Re: number prop [#permalink] New post 27 Oct 2009, 17:19
Ans E.

GCF of x and y can't be greater than the difference between x and y.
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Re: number prop [#permalink] New post 28 Oct 2009, 12:02
hariharakarthi wrote:
Ans E.

GCF of x and y can't be greater than the difference between x and y.


Are you sure about that rule?

GCF of 2 equal numbers is the number itself > difference of the two numbers (0)

I would say the GCF of two numbers can't be greater than either of the numbers.
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Re: number prop [#permalink] New post 28 Oct 2009, 16:49
Bhuvi wrote:
which of the following CANNOT be the greatest common divisor of two positive integers x and y ?

A 1
B x
C y
D x-y
E x+y

Do you assume a random value of x and y for this ?


Thats E: (x +y). Greatest common divisor (GCD) of two integers can never be the sum of these integers. For example:

1 and 1 cannot have GCD of 2.
1 and 5 cannot have GCD of 6.
2 and 3 cannot have GCD of 5.
2 and 5 cannot have GCD of 7.
5 and 5 cannot have GCD of 10.
15 and 25 cannot have GCD of 40.
Similarly, x and y cannot have GCD of (x+y).

However (x-y) is possible: Suppose x = 4 and y = 6. The GDC is x-y = 6-4= 2.

1, x, and y can easily be the GCD of integers x and y.


atish wrote:
hariharakarthi wrote:
Ans E.
GCF of x and y can't be greater than the difference between x and y.


Are you sure about that rule?
GCF of 2 equal numbers is the number itself > difference of the two numbers (0)
I would say the GCF of two numbers can't be greater than either of the numbers.


Thats correct.
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Re: number prop [#permalink] New post 29 Oct 2009, 03:39
GCD of two nos cannot be greater than the two nos.

I will choose option E
Re: number prop   [#permalink] 29 Oct 2009, 03:39
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