1.

IfP -= ((1)/(x_(p)), p ), Q = ((1)/(x_(q)),q), R = ((1)/(x_(r)), r) wherex _(k) ne 0 ,denotes thek^(th)terms of a H.P. fork in N , then :

Answer»

ar. `( Delta PQR)= (p^(2)Q^(2)R^(2))/(2) sqrt((p-q)^(2) + (q-r)^(2) + (r-p)^(2))`
` Delta PQR` is a RIGHT angled triangle
the POINTS P,Q, R are collinear
None of these

Answer :C


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