#### Answer

Possible portfolios: $8\times 15\times 4=480$

#### Work Step by Step

There are 8 Dow Jones stocks
There are 15 NASDAQ stocks
There are 4 global stocks
The different stocks don't affect each other. Therefore, the number of portfolios possible will be the variation of the three numbers.
Possible portfolios: $8\times 15\times 4=480$