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If a, a2 + 2 and a3 + 10 are in G.P., then find the value(s) of a.
Find the geometric progression whose 4th term is 54 and the 7th term is 1458.
Three numbers are in A.P. and their sum is 15. If 1, 4 and 19 are added to these numbers respectively, the resulting numbers are in G.P. Find the numbers.