If for a G.P., p th, q th and r th terms are a, b and c respectively; prove that : (q - r)log a + (r - p)log b + (p - q)log c = 0

Let first term of G.P. be A and common ratio be R. p th term = a AR p - 1 = a. q th term = b AR q - 1 = b. r th term = c AR r - 1 = c. Hence, proved that Hence, proved that (q - r)log a + (r - p)log b + (p - q)log c = 0.