# Question: What Are The Odds Of Shuffling A Deck Of Cards The Same Twice?

## Can you shuffle the same deck twice?

The chances that anyone has ever shuffled a pack of cards (fairly) in the same way twice in the history of the world, or ever will again, are infinitesimally small.

The number of possible ways to order a pack of 52 cards is ’52.

‘ (“52 factorial”) which means multiplying 52 by 51 by 50… all the way down to 1..

## What is the probability of getting two queens?

The probability of drawing the second queen is also 4/52 and the third is 4/52.

## What is an in shuffle?

A riffle shuffle, in which the top half of the deck is placed in the left hand, and cards are then alternatively interleaved from the left and right hands. The ordering of a deck of 52 cards after an in-shuffle is given by 27, 1, 28, 2, 29, 3, … … (OEIS A059952).

## What are the odds of getting the same card twice?

1/52the probability you will get that same card again is 1/52.

## How many times do you have to shuffle a deck of cards to get them back in order?

How many times do you have to shuffle a deck of cards in order to mix them reasonably well? The answer is about seven for a deck of fifty- two cards, or so claims Persi Diaconis.

## Is every deck shuffle unique?

While it’s possible that two packs of cards may have been shuffled into the same order, the odds of that having happened are actually tiny and yes, it’s hugely likely that each properly shuffled deck is indeed a unique variation of those 52 cards. … But a full proper shuffle is almost certainly unique each time.

## How big is 52 factorial?

52! is approximately 8.0658e67. For an exact representation, view a factorial table or try a “new-school” calculator, one that understands long integers.

## What are the odds of shuffling a deck of cards in order?

around 1 in 10If you truly randomise the deck, the chances of the cards ending up in perfect order – spades, then hearts, diamonds and clubs – are around 1 in 10 to the power 68 (or 1 followed by 68 zeros). That’s a huge number, roughly equal to the number of atoms in our galaxy. Yet card players report it happening.

## How many tarot cards are there?

78 cardsThe standard modern tarot deck is based on the Venetian or the Piedmontese tarot. It consists of 78 cards divided into two groups: the major arcana, which has 22 cards, also known as trumps, and the minor arcana, which has 56 cards.

## How many riffles are there?

But most of the time, a deck of cards is shuffled using a riffle. Here’s a question: how many times do you have to riffle a deck of cards before it is completely shuffled? It’s a tricky one, but math has us covered: you need seven riffles.

## Why do we shuffle cards?

Shuffling is a procedure used to randomize a deck of playing cards to provide an element of chance in card games. Shuffling is often followed by a cut, to help ensure that the shuffler has not manipulated the outcome.

## What is a perfect shuffle?

A perfect shuffle can refer to: A shuffling technique perfectly executed, most often meaning “divide cards into two equal piles of 26 cards each, and exactly interleave”.

## How many times can you shuffle a deck?

He said his research also shows that when dealers shuffle several decks at once, they need to shuffle more. Two decks should be shuffled nine times, he said, and six decks should be shuffled 12 times, which is unheard of in the casinos.

## What are the odds of drawing the same card 3 times?

So, there’s a 3/47 probability of drawing a third card that meets our criteria. Finally, we need to combine these probabilities: 9/49 x 6/48 x 3/47 = 162/110544 = 0.001465. There’s a 0.1465% probability of dealing the same three numbers twice in a row from a single deck of cards.

## How do I get better at shuffling cards?

Your other fingers should have a tight grip on the cards in place. Use your thumbs to draw the corners upward, draw the two halves of the deck closer together, then let the cards fall—like a regular shuffle, but only using a small corner of the deck. The very corners of the cards should now be shuffled together.