numbers neglect 1
Probability
Level
2
How many 7-digit numbers that do not start nor end with 1 are there?
The answer is 7200000.
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First number can be filled in 8 ways as 0 and 1 are not possible. Last number can be filled with 9 ways ..rest of the digits in between can be filled with 10 ways.hence 8 10 10 10 10 10 9