arithmetic
posted by Daniel on .
The sum of the first 10th term of an a.p is 255,the sum of the first 20 term is 1010.find the next 2020 term of the progression

10/2[2a+(101)d=255 20/2[2a+(201)d=1010. So a=3, and d=5. Then the 2020 term is 3+(20201)5.And the answer is 10098.