Quantitative Aptitude :: progressions - Discussion

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Explanation:
(log a + log b + log c)/log 6 = 6
(log abc )/log 6 = 6
log6 abc=6
abc = 6^6
From gp series a/r * a * ar =6^6
a^3= 6^6
a=36
so, a= 36/r, b=36, c=36r
c-b = 36r-36
=36(r-1)
Given r can be real number.