How many functions f: {1,2,3,4} {1,2,3,4} are there satisfying: a. f(1) = 1 or f(2)= 2 (or both)? b. f(1) # 1 or f(2) # 2 (or both)? c. ƒ(1) ‡ 1 and ƒ(2) ‡ 2, and ƒ is injective? d. f is surjective, but Va E {1,2,...,4}, f(x) = x? A A J F
How many functions f: {1,2,3,4} {1,2,3,4} are there satisfying: a. f(1) = 1 or f(2)= 2 (or both)? b. f(1) # 1 or f(2) # 2 (or both)? c. ƒ(1) ‡ 1 and ƒ(2) ‡ 2, and ƒ is injective? d. f is surjective, but Va E {1,2,...,4}, f(x) = x? A A J F
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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