Mark the correct alternative in each of the following:

The product to ∞ is equal to

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In a G.P. of even number of terms, the sum of all terms is five times the sum of the odd terms. The common ratio of the G.P. is

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Let x be the A.M. and y, z be two G.M.s between two positive numbers. Then, is equal to

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The two geometric means between the numbers 1 and 64 are

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In a G.P. if the term is p and term is q, then its term is