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Number of functions from A (|A| = n) to B (|B| = m):
Am^n (each of n inputs maps to one of m outputs)
Bn!
Cn × m
D2^n
Answer & Solution
Correct answer: A. m^n (each of n inputs maps to one of m outputs)
Each of n inputs in A independently maps to any of m outputs in B. Total: m^n functions.
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