Question

find the cardinal number for the following set a.
a = {x | x is a letter in the word notice}

the cardinal number of set a is \boxed{}.

Explanation:

Step1: Identify unique letters in "notice"

The word "notice" has letters: n, o, t, i, c, e. Check for duplicates: all are unique.

Step2: Count unique letters

Count the unique letters: n, o, t, i, c, e. There are 6 letters.

Answer:

6