plz ingore what was clicked i mark it by accident unless it the right answer then dont ingore it plzzzzzzzzzzzzz help
1 answer:
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ANSWER
EXPLANATION
The general term of the arithmetic sequence is
For the first term,we substitute
to get,
Similarly
The sum of the first n-terms is given by the formula,
where l is the last term.
In this case
We substitute these values to get,
We could have also used the formula,
EXPLANATION
The general term of the arithmetic sequence is
For the first term,we substitute
Similarly
The sum of the first n-terms is given by the formula,
where l is the last term.
In this case
We substitute these values to get,
We could have also used the formula,