Draw winning raffle numbers

Select unique winning integers from consecutively numbered tickets without constructing the entire ticket array.

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ToolRaffle Draw
Input
Output
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How it works

A sparse partial Fisher–Yates pass chooses an index among the tickets still available and records only the swaps needed for subsequent winners. Rejection-sampled Web Crypto indexes give unseeded tickets equal selection chances, and each selected integer is removed from the remaining pool.

  • One winner is the default, while the ticket total is explicit and capped at one million.
  • Seed text exists for repeatable simulations, not as evidence that a prize draw was independently supervised.

Worked example

3 winners from 50 tickets
Input
											Entries: 50
Winners: 3
Seed: tombola-2026
Output
												Ticket #12
Ticket #16
Ticket #5

When to use this

Charity tombolas draw numbered stubs, event organisers select several door prizes without replacement, and probability classes replay a seeded finite-population sample.

Edge cases

  • Eleven unique winners cannot come from ten tickets, so that request stops before drawing.
  • A chosen seed can be tried after inspecting earlier outcomes, which makes seeded results unsuitable as an audit trail.
  • The eligible set is every integer from 1 through the entered total; missing ticket numbers and multiple tickets held by one person are not modelled.

References