How do you prove the following?
#1/((n-1)!)# + #1/((n-2)!)# = #n^2/(n!)#
Kindly refer to a Proof given in the Explanation.
Using this, we have,
To prove the equality we need to add up the two fractions
To add the two fractions on the left hand side we should first observe that:
So we can write
Now if we multiply both top and bottom by
but the expression at the bottom