Functions Part 2

‌A={1,2,3,4}
‌B={1,4,9,16}
Total number of functions =44
Total number of one-one functions =4 !
Total number of many one functions =44−4!=232
Total number of many-one functions in which 1∉f(A)=3×3×3×3=81
∴ Total number of many one functions 1∉f(A)
‌=232−81
‌=151