Question

A 6-digit code using digits 0 - 9 is given to all cashiers at a store to let them log onto thecash register. How many different codes can there be?

Answer 1

Answer:

There can be 21 different codes

Step-by-step explanation:

Parameters:

Number of codes = 6

Number to choose from = 9

It is not stated that a number cannot be used more than once, so, the different codes that can be there is:

`\begin{gathered} 9C6=(9!)/((9-6)!6!) \\ \\ =(362880)/(17280) \\ \\ =21 \end{gathered}`