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The total number of integer pairs (c, d) satisfying the equation c + d

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The total number of integer pairs (c, d) satisfying the equation c + d  [#permalink]

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New post 25 Nov 2019, 00:37
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A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

43% (01:49) correct 57% (01:13) wrong based on 42 sessions

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Re: The total number of integer pairs (c, d) satisfying the equation c + d  [#permalink]

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New post 25 Nov 2019, 03:02
1
possible pairs
(0,0) & ( 2,2)
IMO C ; 2

Bunuel wrote:
The total number of integer pairs (c, d) satisfying the equation c + d = cd is

A. 0
B. 1
C. 2
D. 3
E. 4


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Re: The total number of integer pairs (c, d) satisfying the equation c + d  [#permalink]

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New post 25 Nov 2019, 07:43
Bunuel wrote:
The total number of integer pairs (c, d) satisfying the equation c + d = cd is

A. 0
B. 1
C. 2
D. 3
E. 4


Couldn't think of any other pairs other than: 0,0 and 2,2 = 2

Ans (C)
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Re: The total number of integer pairs (c, d) satisfying the equation c + d  [#permalink]

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New post 25 Nov 2019, 23:29
Bunuel wrote:
The total number of integer pairs (c, d) satisfying the equation c + d = cd is

A. 0
B. 1
C. 2
D. 3
E. 4


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c+d=cd
c/cd+d/cd=1
1/c+1/d=1
(c,d)=(2,2)
B:)
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Re: The total number of integer pairs (c, d) satisfying the equation c + d  [#permalink]

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New post 26 Nov 2019, 02:28
c+d=cd
d=cd-c
d=c(d-1)
c=d/(d-1)
Now when d=0 c=0
d=1 c=not defined
And when d=2 c=2
d=3 c=3/2=1.5
Thus, For every other integer value of d apart from 0 & 2; c is never an integer.
Therefore only two integer pairs of (c,d) are possible i.e.(0,0) and (2,2).

Answer: C

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Re: The total number of integer pairs (c, d) satisfying the equation c + d   [#permalink] 26 Nov 2019, 02:28
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