Exact draw odds, hand chances, and tracking adjustments for decks of every shape
Use this when cards are drawn without replacement and the deck changes after each pull.
P(X=k) = C(K,k) × C(N-K,n-k) / C(N,n)
Exact, at least, at most, and range odds all come from the same window of k values.
P(window) = sum of every valid k in the range
The total sample space is the number of ways to choose n cards from the adjusted deck.
Total ways = C(N, n)
The mean result uses the share of live target cards left in the deck after tracking.
E(X) = n × K / N
Use a preset or enter your own draw question to see the odds.
Hypergeometric odds sum every valid draw count inside the selected window.
| Step | Value | Meaning |
|---|
| Deck type | Cards | Key target | Best use |
|---|---|---|---|
| Standard | 52 | 4 aces | Classic card math |
| Double deck | 104 | 8 aces | Deeper shoe checks |
| Pinochle | 48 | Double ranks | Short-deck draws |
| Tarot | 78 | 22 trumps | Mixed spread pulls |
| Target | Count | Chance | 1 in N |
|---|---|---|---|
| Specific card | 1 | 1.92% | 1 in 52 |
| Any ace | 4 | 7.69% | 1 in 13 |
| Any face card | 12 | 23.08% | 1 in 4.33 |
| Any suit | 13 | 25.00% | 1 in 4 |
| Hand | Combinations | Probability | 1 in N |
|---|---|---|---|
| Royal flush | 4 | 0.000154% | 649,740 |
| Straight flush | 36 | 0.00139% | 72,193 |
| Four of a kind | 624 | 0.0240% | 4,165 |
| Full house | 3,744 | 0.1441% | 694 |
| Seen cards | Deck left | Ace odds | Note |
|---|---|---|---|
| 0 | 52 | 7.69% | Baseline deck |
| 10 | 42 | 9.52% | Odds rise |
| 20 | 32 | 12.50% | Thin deck |
| 30 | 22 | 18.18% | Strong lift |
If the deck has already lost cards, adjust N before trusting the answer. Smaller decks shift every later probability.
Use exact for a single count, at least for floors, and range for band checks that need both limits.
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Later the second from same array is 12 from 51 because stay 12 cards from that group between 51. Otherwise the chance for particular card be 2 are 1/13. If you gives card to player the likelihood well guess do the forthcoming is higher or low are around 0.5 without consider the three egalkartojn.
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Can be six arrays each 18 cards with spots in different leaf shapes. That cover answers for traditional games that depends of numbered values.