Let A be the alphabet \{a, b\} . Consider the following function definition.
f: A^* \rightarrow \mathbb{N}_0
f(x) = |x|
Which of the following is true about f ?

Question

Let   A  be the alphabet   \{a, b\} . Consider the following function definition. 
  f: A^* \rightarrow \mathbb{N}_0  
  f(x) = |x|  
 Which of the following is true about   f ?

Answer

It is bijective.

Answer

It is surjective, but not injective.

Answer

It is neither injective, surjective, nor bijective.

Answer

It is injective, but not surjective.

Crowdly

Let A be the alphabet \{a, b\} . Consider the following function definit...

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