P=(−5,4) and Q=(−2,−3) . If PQ¯ is produced to R such that p divides QR¯ externally in the ratio 1:2 , thenR is

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(1,10)

(1,−10)

(10,1)

(2,−10)

answer is B.

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Detailed Solution

P divides QR in the ratio1:2 externally ⇒PQ:PR=1:2⇒2PQ=PR ⇒Q is the midpoint of PR⇒R=2Q−P=(1,−10)

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