P&C TREE CALCULATOR

PERMUTATION & COMBINATION · SYMBOL KEYBOARD · TREE VISUALIZATION

STEP 1 — TAP TO SELECT YOUR SYMBOLS (n = 0)

DIGITS

LETTERS

CUSTOM SYMBOLS — type any label (12, AB, √2 …) and press Add

SELECTED tap chip to remove one

Tap digits or letters above...

STEP 2 — SET r (how many to pick)

r = n=0 | r=2

MULTI-SELECT (pick same key multiple times)

REPETITION IN FORMULA (nʳ / C(n+r-1,r))

nʳ / C(n+r-1,r)

FORMULA: Select symbols and set r above

RESULT

TREE DIAGRAM

DRAG TO PAN · SCROLL/PINCH TO ZOOM

Root

Branch

Leaf

ARRANGEMENT VISUALIZER

Pick a layout · use + / - to add or remove boxes · type or drag symbols in

ROWS

COLS

PALETTE - click to fill next empty box, or drag into a box

COLOR BOX ENGINE WEBGPU

Permutation → every square keeps its own color, order matters · Combination → color is stripped, only the group matters

ITEMS (n)

PICK (r)

2D / 3D VIEW (drag to orbit in 3D)