# `¿` — Roll / Deal

Function. Keys: `Alt-/`. Ranks: `0` monadic, `0 0` dyadic

`¿N`: uniform draw from `⍳N`. `¿0`: U(0,1). Pervasive.

``` bpl
¿6 ∊ ⍳6           ⍝ $t
```

`M¿N`: `M` draws without replacement from `⍳N`.

``` bpl
≢3¿10             ⍝ 3ₓ
≢∪3¿10            ⍝ 3ₓ
```

Bounds are nonnegative integers; `M≤N`. Exact arguments give exact
integer draws. Dyalog APL writes Roll and Deal as `?`, which BPL uses
for [predicates](question.qmd).