SOLUTION: strings of length 9 with elements being a, b or c. How many strings will contain at least 6 b’s
I know the answer is 835 but I am looking for a formula or clarification on how t
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-> SOLUTION: strings of length 9 with elements being a, b or c. How many strings will contain at least 6 b’s
I know the answer is 835 but I am looking for a formula or clarification on how t
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Question 371103: strings of length 9 with elements being a, b or c. How many strings will contain at least 6 b’s
I know the answer is 835 but I am looking for a formula or clarification on how the answer is derived please. Thank you. Answer by edjones(8007) (Show Source):
You can put this solution on YOUR website! expand(b+a+c)^9
1 b^9
2*9 b^8...
2*36+72 b^7...
2*84+252*2 b^6...
-------add
835 strings will contain at least 9 b's.
.
Ed
