discrete mathematics h.w help plz?

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k16_4eva

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really need help with this.
find the domain and range of these functions. note that in each case to find the domain,determine the set of elements assigned value by the function.
a). the function that assigns to each non-negative integer its last digit.
b). the function that assigns the next llargest integer to a positive integer
c) the function that assigns to a bit string the number of one bits in the string
d) the function that assigns to a bit string the number of bits in the string
 
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