Answer:
- 3108
Step-by-step explanation:
The sum to n terms of an arithmetic series is
[tex]S_{n}[/tex] = [tex]\frac{n}{2}[/tex] [ 2[tex]a_{1}[/tex] + (n - 1)d ]
Substitute the given values into the formula
[tex]S_{24}[/tex] = [tex]\frac{24}{2}[/tex] [ (2 × - 26) + (23 × - 9) ]
= 12 ( - 52 - 207 )
= 12 × - 259 = - 3108
