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We know that, if `a_1, a_2, ..., a_n` are in H.P. then `1/a_1,1/a_2,.....,1/a_n` are in A.P. and vice versa. If `a_1, a_2, ..., a_n` are in A.P. with common difference d, then for any `b (>0)`, the numbers `b^(a_1),b^(a_2),b^9a_3),........,b^(a_n)` are in G.P. with common ratio `b^d`. If `a_1, a_2, ..., a_n` are positive and in G.P. with common ration, then for any base `b (b> 0), log_b a_1 , log_b a_2,...., log_b a_n` are in A.P. with common difference logor.If `x, y, z` are respectively the pth, qth and the rth terms of an A.P., as well as of a G.P., then `x^(z-x),z^(x-y)` is equal to

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