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3 April, 10:19

If pqr = 1, rst = 0, and spr = 0, which of the following must be zero?

A. P

B. Q

C. R

D. S

E. T

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Answers (1)
  1. 3 April, 11:38
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    P, Q, R can't be 0, because their product is nonzero. Either of S and T could be 0, but the third one only works if S is 0.
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