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in Differential equations by (50.2k points)

Find the number of many-one function between two sets A = {1, 2, 3} and B = {4, 5, 6} such that f(1)  4

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Number of many one function = Number of total function – Number of one-one function. 

= 33 – 2 = 27 – 2 = 25

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