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2021 AMC 12B Question 14

AMC12 · 2021 AMC 12B

Question 14

Let $ABCD$ be a rectangle and let $\overline{DM}$ be a segment perpendicular to the plane of $ABCD.$ Suppose that $\overline{DM}$ has integer length, and the lengths of $\overline{MA},$ $\overline{MC},$ and $\overline{MB}$ are consecutive odd positive integers (in this order). What is the volume of pyramid $MABCD?$
  1. $24\sqrt5$
  2. $60$
  3. $28\sqrt5$
  4. $66$
  5. $8\sqrt{70}$