How many four letter word with or with out meaning can be formed from logarithms?
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there are 4 places , ones , tens ,hundredth , thousandth
we can put any of 10 letters at these places
therefore total no. of words are 10×10×10×10
= 10000
we can put any of 10 letters at these places
therefore total no. of words are 10×10×10×10
= 10000
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