Discussion
5, 40, 280, 1680, 8400, ?
Answer: C
The next term is 33600.
Each term is the previous one multiplied by a number that falls by 1 each time:
\[ \begin{aligned} 5 \times 8 &= 40,\quad 40 \times 7 = 280 \\ 280 \times 6 &= 1680,\quad 1680 \times 5 = 8400 \\ 8400 \times 4 &= 33600 \end{aligned} \]
The other options are close to 33,600 but are not 8400 times any whole number in the pattern.
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