The number of 10 digit number that can b...

The number of 10 digit number that can be written by using the digits 2 and 3 is

`.^(10)C_(2) + .^(9)C_(2)`

`2^(10)`

`2^(10)- 2`

10!

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SURA PUBLICATION-COMBINATORICS AND MATHEMATICAL INDUCTION -Exercise 4.5

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