an = a+(n-1)d Where an=last term a=first term d=common difference n=number of term Note: last term is denoted by an or l Sn=n/2[2a+(n-1)d Sn=sum of all terms
Well, π is an irrational number. now you will be thinking if π is equal to 22/7. then why is it irrational while a/b is a rational no. But my dear π is irrational because it values is not certain....