Question

(p + q + r + s) (p – q - r + s)

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Answer 1

Step-by-step explanation:

Correct option is

A

qr=ps

⇒ We have, p:q::r:s

⇒

q

p

=

s

r

⇒ p×s=r×q

⇒ ps=rq i.e. qr=ps

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Answer 2

Answer:

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Step-by-step explanation:

(p+q+r+s)(p-q-r+s) = p^2-q^2-r^2+s^2+2ps-2qr is answer..