SOLUTION: The first term of an A.P is 7 and the sum of the first 40 terms is 1216. Find the nth term, and the 20th term.
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Question 520848: The first term of an A.P is 7 and the sum of the first 40 terms is 1216. Find the nth term, and the 20th term.
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
The sum of 
terms of an arithmetic progression is given by either:
)
or
d\right))
Use the second one with the given information to calculate 
, the common difference.
Then the th term is d)
and the 20th term is 
John
My calculator said it, I believe it, that settles it
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