1.

If P = (1/x_p,p),Q=(1/x_q,q),R=(1/x_r,r)where x_kne0,k =p,q , r ne N , denotes the k^(th) term of a Harmonic progression , then

Answer»

<P>Area `(DELTAPQR)=(p^2q^2r^2)/2sqrt((p-q)^2+(q-r)^2+(r-p)^2)`
`DeltaPQR` is a RIGHT angled TRIANGLE
the points P,Q and R are collinear
none of these

Answer :C


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