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a
p = 1
b
p = 1 or 0
c
p = – 2
d
p = – 2 or 0
answer is B.
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Detailed Solution
We have p + q = – p, pq = qAs pq = q,we get q(p – 1) = 0⇒ q = 0 or p = 1If q = 0, we get p = 0If p = 1, we get p + q = – p⇒ q = – 2.Thus, p = 1 or p = 0.