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CMI2014-A-07

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Let $M$ be the maximum number of unit disks (disks of radius $1$) that can be placed inside a disk of radius $10$ so that each unit disk lies entirely within the larger disk and no two unit disks overlap. Then:

  1. $M < 25$
  2. $25 \leq M < 40$
  3. $40 \leq M < 55$
  4. $M \geq 55$
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