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# For non-zero integers a, b, c and d, is ab/cd positive? (1)

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Joined: 12 Jun 2006
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Kudos [?]: 29 [0], given: 1

For non-zero integers a, b, c and d, is ab/cd positive? (1) [#permalink]  26 Oct 2006, 14:36
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For non-zero integers a, b, c and d, is ab/cd positive?

(1) ad + bc = 0

(2) abcd = -4

I say D.
SVP
Joined: 01 May 2006
Posts: 1805
Followers: 8

Kudos [?]: 98 [0], given: 0

(D) as well

ab/cd > 0

Stat 1 :

Since a, b, c and d are not equal to zero, we have

Multiplying or dividing by number gives the same sign to the result, thus

SUFF

Stat 2 :
Same reasonning as above:

Sign(a*b*c*d) = Sign(ab/cd) < 0

SUFF
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