SOLUTION: The sum of an arithmetic progression is given by Sn = 1/2 (5n^2 + n)
i) Find the sum of the first 5 terms
ii) Find the fifth term
Thank you
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-> SOLUTION: The sum of an arithmetic progression is given by Sn = 1/2 (5n^2 + n)
i) Find the sum of the first 5 terms
ii) Find the fifth term
Thank you
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Question 1177528: The sum of an arithmetic progression is given by Sn = 1/2 (5n^2 + n)
i) Find the sum of the first 5 terms
ii) Find the fifth term
Thank you Answer by ikleyn(52800) (Show Source):
(i) The sum of the first 5 terms is .
To find it, substitute n= 5 into the given formula.
Making so simple calculations is a ROUTINE job, which I leave to you.
(ii) The 5-th term is equal = - .
You just found in part (i).
Now calculate in the same way and then take the difference.
You just have full instructions to complete the job on your own.
