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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