You can put this solution on YOUR website! I'm not sure if you mean
1.
or if you mean
2.
Either way, here goes.
Substitute for n=1/5,
1.
You need a common denominator to add fractions.
1.
1.
Dividing by a fraction is equivalent to multiplying by the reciprocal.
1.
1.
.
.
.
And now for 2.
2.
2.
2.
2.
2.