SOLUTION: In how many distinct ways can a 15-digit number be made using eight 7s and seven 8s?

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Question 965234: In how many distinct ways can a 15-digit number be made using eight 7s and seven 8s?
Answer by Edwin McCravy(20054) About Me  (Show Source):
You can put this solution on YOUR website!
Choose the positions for the eight 7s in 15C8 = 6435 ways
Put 7 8s in all the other positions in only 1 way.

Answer: 6435 ways.

Edwin