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Determine the number of 5 cards combinations out of pack of 52 cards if at least 3 out of 5 cards are ace cards?

1 Answer

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Best answer

There are 4 ace cards in a pack of 52 cards, therefore we can choose maximum 4 ace cards. 

Case 1: 3 cards of ace and 2 cards out of remaining 4 cards 

i.e. 5 cards combinations out of 52 cards = 4C3 × 48C2 

= \(\frac{4!}{3!\space1!}\times\frac{48!}{2!\space46!}\) 

= \(4\times\frac{48\times47}{2}\) 

= 4512 

Case 2: 4 cards of ace and 1 card out of 52 remaining cards 

i.e. 5 cards combinations out of 52 cards = 4C4 × 48C1 

= \(\frac{4!}{4!\space0!}\times\frac{48!}{1!\space7!}\) 

= 1 × 48 

Hence, total number of combinations are = 4512 + 48 

= 4560

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