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[" 4.If "qr:pr:pq=1:4:7" .then find "(p)...

[" 4.If "qr:pr:pq=1:4:7" .then find "(p)/(qr):(q)/(pr)],[[(a)4:1," (b) "1:4],[" (c) "1:16," (d) "16:1]]

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