Question

if the sum of first k terms of an ap is 3k2-k and its common difference is 6 then the first term is ​

Answer 1

Answer:

a = 2

Step-by-step explanation:

Answer 2

The first term is 2.

Step-by-step explanation:

Given : If the sum of first k terms of an A.P is $3k^2-k$ and its common difference is 6.

To find : The first term ?

Solution :

The sum of first k terms of an A.P is  $S_k=3k^2-k$

If we put k=1 we get the sum of first term i.e. first term.

So, $S_1=3(1)^2-(1)$

$S_1=3-1$

$S_1=2$

So, The first term is 2.

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