SOLUTION: Which term of the series 79,77,75___ is 47.find out the an.
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Question 980165: Which term of the series 79,77,75___ is 47.find out the an.
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
Which term of the series ,,___ is .
find out the
as you can see, the differences between each pair of numbers are always , each next term is less then previous one
(the first term)
(the "common difference" between terms)
And we get:
{ , , , , ... }
We can write an arithmetic sequence as a rule:
(We use "" because is not used in the 1st term).
check the formula:
calculate which term is equal to :
so, is term
check:
,,,,,,,,,,,,,,,,
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