If the fourth, seventh and tenth terms of a G.P. are x, y, z respectively, prove that x, y, z are in G.P.
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The 5th, 8th and 11th terms of a G.P. are p, q and s respectively. Show that q2 = ps.
If a, a2 + 2 and a3 + 10 are in G.P., then find the value(s) of a.