Replacing values in a data frames based on condition

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I want to convert values 0<x<9 & x<50.2 to NA.My data frame has the first five columns which do not have to have replaced, I only want to replace values in column 6 to column 60. I have tried to it in 2 steps as follows but, it also replaced values I dont intend to change

BdsDf[BdsDf > 50.2][6:60] <- NA; BdsDf[BdsDf < 9][6:60] <- NA



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