Asked by Sania
The fourth term of an AP is 10 and eleventh term of it exceeds three times the fourth term by 1. Find the sum of first 20 terms.
Answers
Answered by
Steve
find a and d using what they have told you:
a+3d = 10
a+10d = 3(a+3d)+1
Then just evaluate
S20 = 20/2 (2a+19d)
a+3d = 10
a+10d = 3(a+3d)+1
Then just evaluate
S20 = 20/2 (2a+19d)
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