How many different sandwiches are possible and how many different sandwiches are possible if there is an option for no meat

Question

A sandwich is made of

-white or brown bread

-ham, chicken or beef

- mustord or mayo.

Answer 1

Assuming meat is required and that the bread, meat and condiment are independent (that is, bread choice doesn't impact meat or condiment choice, meat choice doesn't impact bread or condiment choice, and condiment choice doesn't impact bread or meat choice):

2 bread choices x 3 meat options x 2 condiment options = 2 x 3 x 2 = 12 different sandwiches

If there's an option for no meat, we have 2 bread options, 2 condiment options and 4 meat options (ham, chicken, beef or none). This gives 2 x 2 x 4 = 16 different sandwiches.