the sum of 15 terms of an arithmetic sequence with common difference 6 is 780.write the algebric expression of the sequence
Answers
Answered by
5
Answer:
Step-by-step explanation:
Sum of terms in AP=n/2(2a+(n-1)d)
780=15/2(2a+14*6)
780=15(a+42)
780/15=a+42
a=52-42
a=10
Hope this is helpful please mark me as brainliest
Answered by
0
Answer:
https://brainly.in/question/19975681
Step-by-step explanation:
Similar questions