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Let A = log 729
=> A = log (9 * 9 * 9)
=> A = log (3 * 3 * 3 * 3 * 3 * 3)
=> A = log 36
=> A = 6 * log 3
=> A = 6 * 0.4771 {Since log 3 = 0.4771}
=> A = 2.8626
So, log 729 = 2.8626