In an AP, the sum of n terms is 1/2(5nsq+3n).Find it\'s 40th term

1.	In an AP, the sum of n terms is 1/2(5nsq+3n).Find it\'s 40th term
Answer» First put the value of n equal to 1 then put the value of n equal to 2 hence you will get the by putting the value of an equal to one you will get the value of a means which is the first time then when you put the value of n equal to 2 then you will get the sum of first time in the second time by that you can find the d and hence you can find the 40 term

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