How do you calculate combinations on TI-84?

Hint: Combinations in mathematics can be simply explained as a mathematical technique that determines the number of arrangements possible collection of items where the order of the selection does not matter.So in combinations we can select an item in any order.Now by using this basic definition we can see how to find the combinations on a TI-84.

Complete step by step answer:
Given statement: To calculate combinations on TI-84.
Now TI-84 is an example of a graphing calculator.
A graphing calculator is a hand held device which is capable of solving equation plotting graphs and other functions involved with variables.
Now our aim is to calculate combinations on TI-84.
Some of the buttons on the TI-84 useful to calculate combinations are:
$MATH,\;PRB - menu,\;nCr$
Also to demonstrate the calculation let’s take an example:
E.g. To select 4 students from a class of 30.
Now the steps we should follow to calculate combinations on TI-84 using the above example are:
1. Since here the total students are $30$, first let’s type in $30$.
2. Now we have to select the \[MATH\] button which should be followed by the \[PRB - menu\] which can be seen in the far right.
3. Now we have to select the $nCr$ button.
4. Since here we have to select $4$ students, we have to type in $4$ in the calculator and $enter$
5. Now the number of combinations can be screen flashed on the calculator screen.

Note: A graphing calculator can be used for numerous other functions too.
Some of the other buttons on the graphing calculator are\[{\text{y = , 2nd, calc, and window}}\]. Also care must be taken while performing functions on the buttons since the chances of production of error is large in these type of operations.