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A string of digits is any sequence of digits ( 0 , 1 , 2 , 3 , 4 , 5 , 6 , 7

A string of digits is any sequence of digits

(0, 1, 2, 3, 4, 5, 6, 7, 8, 9)

in order. A string may start with

0,

so valid

5 -

digit strings include

24236

and

)

How many

5 -

digit strings are there?

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