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Grade: 11 

                        
Find the sum of n terms of A.P. whose rth term is 2r+3
3 years ago

Answers : (1)

Arun
24742 Points 
							
Tr = 2r +3
Hence 
Tn would be = 2n +3
Now
Sim of n terms will be
Sn = \sum(2n+3)
= 2 n(n+1)/2  +3n
= n(n+1) + 3n
= n² +4n
3 years ago
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