How many different pizza's can be ordered if the restaurant offers 15 different toppings and there is not limit to the number of toppings on the pizza?

If there are 15 different toppings, and each one can be either on the Pizza or

not on the pizza, then the quantity of possibilities is the same as the quantity

of binary numbers that can be written with 15 bits.

Also the same as the greatest quantity of columns that a spreadsheet can have

in Excel 97, the total memory that a program in QwikBasic can address, and the

total physical memory that each computer aboard Apollo 11 had.

That's 65,535, usually called "64 K".

Save me a slice of any meatless one.