Question

What is the sum of a 52–term arithmetic sequence where the first term is 1 and the last term is 154?

Answer 1

The sum is `4030`.

Explanation:

`color(blue)(S(n) = (n/2) (A1 + An)`

`rarrS(52) = (52/2) (1 + 154)`

`rarrS(52) = 26 (155)`

`rArrS(52) = 4030`