Let X = {n E N :0

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Let X = {n E N :0 <n< 999} be the set of all numbers with three or fewer digits. Define the function f : X → N by f(abc) = a +b+c,
where a, b, and c are the digits of the number in X (write numbers less than 100 with leading 0's to make them three digits). In other words,
(f) returns the sum of the digits of its input. For example, f(253) = 2+ 5+3 = 10.
a. Let A = {n E X : 306 < n < 323}. Find f(A).
b. Find ƒ-1({1,3})
c. Find f-'(2).
d. Find ƒ '(52).
Transcribed Image Text:Let X = {n E N :0 <n< 999} be the set of all numbers with three or fewer digits. Define the function f : X → N by f(abc) = a +b+c, where a, b, and c are the digits of the number in X (write numbers less than 100 with leading 0's to make them three digits). In other words, (f) returns the sum of the digits of its input. For example, f(253) = 2+ 5+3 = 10. a. Let A = {n E X : 306 < n < 323}. Find f(A). b. Find ƒ-1({1,3}) c. Find f-'(2). d. Find ƒ '(52).
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