$a_n=48*0.5^(n-1)$
$n = 4$ which gives us $a_n=48*0.5^(4-1)$
with the result bieng 6 because it was the fourth item in the sequence.

or

$(48/2) = 24$
$(24/2) = 12$
$(12/2) = 6$

6 comes next in the series.
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