SOLUTION: The 2nd term of an A.P is (a-b) and 4th term is (a+b), find the 5th term and sum of the first 5 terms of the A.P
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Question 1008007: The 2nd term of an A.P is (a-b) and 4th term is (a+b), find the 5th term and sum of the first 5 terms of the A.P
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
d, common difference
index 2, term is a-b
index 4, term is a+b
The term at index 1 is .
The general term for the sequence using n for iNdex is .
The term at index 5?
You can look for the formula for sum of an arithmetic sequence to answer sum of the
first five terms. You might also just use this:
, and you know n=5 here.
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