There are 755,82 possible 9-card hands with a 21-card deck.
In a 21-card deck, there are 9 cards, as indicated in the question. To find the number of possible 9-card hands, we can use the combination formula.
The formula for finding the number of combinations is given by C(n, r) = n! / (r!(n-r)!), where n is the total number of cards in the deck and r is the number of cards in the hand.
In this case, n = 21 and r = 9. Plugging these values into the formula, we get C(21, 9) = 21! / (9!(21-9)!) = 755,82.
Therefore, there are 755,82 possible 9-card hands with a 21-card deck.