Find 5 geometric means between 1 and 27.

Find the sum of the sequence 96 - 48 + 24 ……… upto 10 terms.

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