Question

An arithmetic series consist of consecutive integers that are multiples of 4. whats the sum of the first nine terms of this sequence if the first term is 0?

Answer 1

9514 1404 393

Answer:

144

Explanation:

The first 9 terms are ...

0 4 8 12 16 20 24 28 32

The average term is (32+0)/2 = 16.

The sum is the product of the number of terms and the average term:

S9 = 9×16 = 144

The sum of the first 9 terms is 144.