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What is the square root of 1/169?
##1/13##
The square root of ##1## is
##sqrt(1) = 1##
The square root of ##169## is
##sqrt(169) = sqrt(13 * 13) = 13##
Hence, the square root of their ratio will be equal to the ratio of their square roots
##sqrt(1/169) = sqrt(1)/sqrt(169) =1/13##