SOLUTION: The first term of an arithmetic progression is -8. The ratio of the 7th term to the 9th term is 5:8. Calculate the common difference.
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Question 918942: The first term of an arithmetic progression is -8. The ratio of the 7th term to the 9th term is 5:8. Calculate the common difference.
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
, index being n, common difference being d.
Ratio of seventh term to ninth term is 5:8,
That is the key equation to form; and solving it should be a comfortable process. You basically want to determine the value of d, common difference between terms.
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