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Maths help?
The 4th term of an arithmetic sequence is 17
The 10th term of the same arithmetic sequence is 35
find the sum of the first 50 terms of the sequence
1 Answer
Relevance
- tcLv 73 years ago
=>
d = (35-17)/(10-4) = 3
17 = a(1) + (4-1)*3
a(1) = 8
a(50) = 8 + (50-1)*3 = 155
S(50) = 50*(8+155)/2 = 4075
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