log2 x + log4 x+log16 x=21/4
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Answer:
log4 x = (1/2) log2 x
log16 x = (1/4) log2 x
so the above expression can be written like this
(1+1/2+1/4) * log2 x = 21/4
(7/4)* log2 x = 21/4
log2 x = 3
x= 2^ 3 = 8
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