Question

. If the sum of first K terms of an A.P is 3K^2 - K and its common difference is 6 find the first term?​

Answer 1

Answer:

Step-by-step explanation:

First term is 0 !

Put n=k in formula of first term .....

At one step you will get ,

3k²-k=an+3n²-3

Replacing n=k,

3k²-k=ak+3k²-3

So, gradually value of a=0 !