Asked by Sofiat
The sum of the first 21 terms of the progression ,_18,_15,_12,---is
Answers
Answered by
oobleck
_ and - are not the same!
Anyway, it should be clear that for this AP,
a = -18
d = 3
So, using your trusty formula,
S21 = 21/2 (2a+20d)
Now plug and chug.
Anyway, it should be clear that for this AP,
a = -18
d = 3
So, using your trusty formula,
S21 = 21/2 (2a+20d)
Now plug and chug.
There are no AI answers yet. The ability to request AI answers is coming soon!
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.