if P- Q- R- and d(P,Q)= 2, d(P,R)=10 then find d(Q,R)=?
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Answer:
(B) 8
d(P, R) = d(P, Q) + d(Q, R)
∴ 10 = 2 + d(Q, R)
∴ d(Q, R) = 8
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