If the sum of first n terms of an A.P. i...

If the sum of first n terms of an A.P. is ` an^(2) + bn `
and ` n^(th) ` term is An + B then

A

A= 2a

B

A = a

C

a = 2A

D

A = 3a

Text Solution

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Knowledge Check

If the sum of first n terms of an A.P. is 3n^(2)-2n , then its 19th term is

A

123

B

118

C

109

D

107

If the sum of n terms of an A.P. is 2n^(2)+5n then the n^(th) term will be

A

`4n+3`

B

`4n+5`

C

`4n+6`

D

`4n+7`

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