Question

How many ways can four items be selected from a group of six items?

Answer 1

We need to select 4 items from a group of 6 items

Here , order of selection does not matters

So combination is applied .

That is we need to find 6C4

The formula for combination is ,

        

We can directly use the technology , like Excel function   =COMBIN( 6 , 4 )     = 15

Therefore the number of ways can four items be selected from a group of six items is 15 .