6561, 81, 9, ____?
3 \( \frac{1}{2} \)
3
4 \( \frac{1}{2} \)
4
B. 3
6.4 x 3.8 x 4.2 x 0.3
30.6432
72.0192
00.0192
None of the above
A. 30.6432