means this long thing:



And then you cancel all that will cancel and you get this:



And all you have left is



Then cancel the 2 into the 60



That's the formula for the combinations of 68 things taken 58 at a time
C(60,58)

A much, much easier formula for combinations:

C(a,b) if b is larger than half of a, then subtract b from a.  Then

For the numerator start with a and use b factors, each one less than the
preceding.
For the denominator start with b and use b factors, each one less than the
preceding.

So if you have C(60,58)

Since 58 is larger than half of 60, subtract 60-58 = 2.

Then you have C(60,2) and by the easier formula,

.



Edwin