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Grade: 11

                        

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

2 years ago

Answers : (2)

Meet
137 Points
							The general term is 2r+3 so the sum is        2[n(n+1)/2] + 3n and it`s value is equal to n^2+4n..............
						
2 years ago
Aryan Vartak
24 Points
							r th term is 2r + 3So 2r + 3 = a + (r - 1)d     2r + 3 = a + dr - d(dr = 2r)(d = 2)     2r + 3 = a + 2r - 2     3 = a - 2(a = 5)Sum of n terms in AP is (n/2)[2a+(n-1)d]Substituting the values of `a` and `d`We get:(n/2)[(2*5)+(n-1)*2]All the 2`s in the equation cancel out, leaving:n(5+n-1) = n(4+n) = n^2 + 4n
						
2 years ago
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