Question

show that sum of an ap whose 1st term is a, second term is b and last term is c is equal to Sn=(a+c)(b+c-2a)÷2(b-a)​

Answer 1

Answer:

show that sum of an ap whose 1st term is a, second term is b and last term is c is equal to Sn=(a+c)(b+c-2a)÷2(b-a)