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Stdle #3 · 2026-06-09

What does this log?

A past puzzle — fully playable. 4 attempts, hints on wrong guesses.

1puts [1, 2, 3].combination(2).to_a.inspect

Arrays

Your guess · console output

4 attempts left

Answer & explanation

Console output

[[1, 2], [1, 3], [2, 3]]

Why

`Array#combination(n)` generates all combinations of `n` elements (order-independent). From `[1, 2, 3]`, the 2-element combinations are `[1, 2]`, `[1, 3]`, and `[2, 3]` — C(3,2) = 3 combinations.

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