Counting many to one functions (JEE Mains) | ExamDuo
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One-one, onto, into and bijective functions
Medium
Counting many to one functions
Let A = {1, 2, 3, 4} and B = {1, 4, 9, 16}. Then the number of many-one functions f : A → B such that 1 ∈ f(A) is equal to :
SELECT ONE OPTION
A
127
B
151
C
163
D
139
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