Question
Fri March 11, 2011 By: Nachiket Arora

if the sum of first 4 terms is 10 and that of first 14 terms is 280, find the sum of its first n terms

Expert Reply
Fri March 11, 2011
Dear student,
 
Let a be the first term and d be the common difference of the AP.
 
Using the given information, we have:
We hope that clarifies your query.
 
Regards,
Team
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