F 25. For each natural number n, 1+ 2 +...+ n=(n² + n)/2.
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter3: Functions And Graphs
Section3.5: Graphs Of Functions
Problem 30E
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Mathematical Reasoning
Writing and Proof:
True or False?
Transcribed Image Text:F
25.
For each natural number n, 1+ 2 +...+ n = (n² + n)/2.
T
F
26.
A function fis not an injection means that for all a and b in the domain of f, if
f(a)=f(b), then a + b.
F
27.
The inverse relation of every function is a function.
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