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Q.

P (-1,4), Q(11,-8) divides AB harmonically in the ratio 3:2 then A,B are

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a

(4,7), (1,-2)

b

(1,2), (-4,7)

c

(7,4), (2,1)

d

(2,1), (7,-4)

answer is B.

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Detailed Solution

A, B divides PQ harmonically in the ratio m-n:m+nA, B  divides PQ in the ratio 1:5 internally and externallyA=11-51+5,-8+201+5=1, 2 11+51-5,-8-201-5=-4,7
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P (-1,4), Q(11,-8) divides AB harmonically in the ratio 3:2 then A,B are