For an aspiration, a syringe is attached to the needle to collect a small amount of marrow. For a bone marrow biopsy, a special needle is used that allows the collection of a solid core (a cylindrical sample) of marrow.
Lottery wheeling. Lottery wheeling (also known as lottery system, lottery wheel, lottery wheeling system) is used by individual players and syndicates to distribute a subset of the possible lottery numbers across multiple tickets to ensure that at least one of these tickets will contain a winning combination if several draws are in this subset.
For a roulette wheel with n green numbers and 36 other unique numbers the chance of the ball landing on a given number is 1 ( 36 + n ) {\displaystyle {\frac {1}{(36+n)}}} . For a betting option with p numbers that define a win, the chance of winning a bet is p ( 36 + n ) {\displaystyle {\frac {p}{(36+n)}}}.