what is the sum of first 25 terms of an arithmetic sequences 1,6,11
Answers
Answered by
0
Answer:
hii I think that it helps you
Step-by-step explanation:
Since the n th term of an arithmetic sequence is given by the following formula: an=a1+d(n−1) , where d is the common difference. So the sum of the first 25 terms of your series is 3775.
Answered by
4
Answer:
1525
Step-by-step explanation:
S = 25/2 ( 2*1 + ( 25-1)*5)
= 25/2 (2+ 24*5)
= 25/2 ( 122)
= 25 *61
= 1525
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