Rules of Sum and Product#
These rules are best explained with the help of some examples.
Rule of Sum#
Example
Suppose John has two ballpoint pens, three fountain pens, and a gel pen. How many pens does John have in total?
Rule of Product#
Example
Suppose Jane has four different shirts, three different pants, and two pairs of shoes. How many different outfits can Jane wear?
Example
How many 5-digits number are odd?
Last update: May 14, 2021