Complete the series 564, 152, 48, 21, $$\frac{?}{}$$ from the following options :
Firstly, (564/4) = 141+11 => 152.
(152/4) = 38+10 => 48
(48/4) = 12+9 => 21, and (21/4)+8 = 13.25
Hence the next term is 13.25. The correct option is D
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