Question

what is the sum of first 25 terms of an arithmetic sequences 1,6,11
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Answer 1

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.

Answer 2

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