$\"\"$

\

a.

\

In the sequence representing customers that had a positive experience or heard a positive

\

review, out of the $\"\"$ customers, $\"\"$ found the experience enjoyable and each told $\"\"$ friends over the next month.

\

$\"\"$ , $\"\"$ , and $\"\"$ since this process continues for next $\"\"$ months.

\

Sum of first $\"\"$ terms :

\

$\"\"$

\

Therefore, $\"\"$ people had a positive experience or heard a positive review in the first $\"\"$ months.

\

$\"\"$

\

b.

\

Suppose the $\"\"$ unhappy customers each told $\"\"$ friends over the next month about the experience.

\

This group then each told $\"\"$ friends, and so on, for $\"\"$ months

\

In the sequence representing customers that had a negative experience or heard a negative

\

review, $\"\"$ and $\"\"$ , $\"\"$ ,since this process continues for next $\"\"$ months.

\

Sum of first six terms.

\

$\"\"$

\

Therefore, $\"\"$ people had a negative experience or heard a negative review in the

\

first $\"\"$ months.

\

$\"\"$

\

a.

\

$\"\"$ people had a positive experience or heard a positive review in the first $\"\"$ months.

\

b.

\

$\"\"$ people had a negative experience or heard a negative review in the first $\"\"$ months.