Question: Let Str be the set of alphanumeric strings and * let N be the natural numbers. Define a function d:StrN by d(s)= the sum of

Let Str be the set of alphanumeric strings and * let N be the natural numbers. Define a function d:StrN by d(s)= the sum of all digits in s. For example, d("123")=6, d( "10SNE1" )=2,d( "foobar") =0, and d("10+23=33")=12. Write a short proof that d is onto

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4. Explain the strengths and weaknesses of each approach.

d. Describe any challenges in trying to communicate. If there were no challenges, explain why you think it was so easy.

3. Identify the methods used within each of the three approaches.