the first and last term arithmetic sequence are 9 and 165 respectively.if the sum of all the terms of the arithmetic sequence is
3480,find the number of terms and the common difference of this arithmetic sequence
2 answers:
Answer:
Step-by-step explanation:
<u>Sum of n terms formula:</u>
<u>Solving for n</u>
- 3480 = 1/2n(9 + 165)
- 3480 = 87n
- n = 3480/87
- n = 40
Answer:
<h3><u>Required Answer</u><u>:</u><u>-</u></h3>
- first term =a=9
- Last term =l=165
- Sn=3480
As we know that in a AP














Number of terms=40.
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