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Briey explain to justify your solution and show your work. Consider all strings of 7 decimal digits; for example, 2330179 and 0012998. How many such

Briey explain to justify your solution and show your work.

Consider all strings of 7 decimal digits; for example, 2330179 and 0012998. How many such strings:

(a) Begin with a 1?

(b) Contain at least one 2?

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