How many onto functions can be defined from the set A = {1, 2, 3, 4} to {a, b, c}?
81
79
36
45
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36 functions can be defined from the set.
3⁴-³C1(3-1)⁴+³C2(3-2)⁴
81-3(16)+3(1)
81-48+3
81+3-48
84-48
36
therefore the sets defined from functions are 36
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