Question

if the sum of first term of ap is given sn = 3n square +3 find its first term
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Answer 1

Answer:

The first term is a=2.

The common difference is 6.

The nth term of the sequence is

Step-by-step explanation:

Given : The sum of first n terms of an A.P is given by

To find : Its nth term and first term and common difference ?

Solution :

The sum of first n terms of an A.P is given by

If we put n=1 we get sum of first term i.e. first term,

The first term is a=2.

If we put n=2 we get sum of first two term,

The second term is 8.

The common difference is

The common difference is 6.

The nth term of the sequence is

The nth term of the sequence is