Calculate s4 for the sequence defined by

The correct answer option is 36.

Step-by-step explanation:

We know that,

the sum of the first n terms of an Arithmetic Sequence is given by:

where is the number of terms,

is the first term of the sequence; and

is the first term of the sequence.

So for ,

Putting these values in the formula to get:

Therefore, the 4th term of the given sequence is 36.

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