How many seven digit numbers with repeating digits of some type can be formed?

Question

Question

math Statistics-And-Probability

Answer 1

Answer #1

For a seven digit number, the starting digit must be non zero, for rest digits, we have 10 possibilities each. Hence,

Total number of seven digit numbers possible = 9*10*10*10*10*10*10 = 9000000

Answer 2

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