Pregunta
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How many 7 card hands are possible with a 26 -card deck? The number of hands is \( \square \).

Ask by Young Lowe. in the United States
Mar 09,2025

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There are 657,800 possible 7-card hands from a 26-card deck.

Solución

We want to count the number of 7‑card hands from a deck of 26 cards. This is a combinations problem, where order does not matter. The formula for choosing \( k \) items from \( n \) items is given by \[ \binom{n}{k} = \frac{n!}{k!(n-k)!}. \] Here, \( n = 26 \) and \( k = 7 \). Thus, the number of hands is \[ \binom{26}{7} = \frac{26!}{7!(26-7)!} = \frac{26!}{7!19!}. \] We can also express this in its multiplicative form: \[ \binom{26}{7} = \frac{26 \times 25 \times 24 \times 23 \times 22 \times 21 \times 20}{7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1}. \] Evaluating this gives \[ \binom{26}{7} = 657800. \] The final answer is \[ \boxed{657800}. \]

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Extra Insights

To find out how many 7-card hands can be formed from a 26-card deck, we use the combination formula \( C(n, r) = \frac{n!}{r!(n-r)!} \). Here, \( n = 26 \) and \( r = 7 \). Calculating it gives us: \[ C(26, 7) = \frac{26!}{7!(26-7)!} = \frac{26!}{7! \times 19!} \] Computing this: \[ = \frac{26 \times 25 \times 24 \times 23 \times 22 \times 21 \times 20}{7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1} = Stanley!924 \] So, the number of possible 7-card hands is \( \boxed{65780} \). Now, let's rock your knowledge with some extra fun facts! First, did you know that card games have a fascinating history that dates back to ancient China around the 9th century? The earliest documented card games were related to gambling! As card decks evolved, playing cards became popular across various cultures, incorporating unique symbols and designs reflective of their origins. Second, in the realm of card strategies, proper hand evaluation is key! A common mistake many make is not considering the probability of drawing specific cards or estimating the strength of their hand. Always think strategically, and you might find yourself holding the winning hand!

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