Question

If A={a,b,c,d),B={s,t,u} and f={(a.s) (bu)(d,t)} then "f"
from A to B is
A) one-one function only
B) onto function only
C) Bijection
D) Not a function​

Answer 1

D) Not a function

A = {a, b, c, d}

B = {s, t, u }

f = {(a, s) (b, u) (d, t)

According to definition of function,

Every element of A must be used once then only f : A —> B is called function

But in above question, The element of A (c) is not used.

So, it's not a function