Mathematics, 05.12.2020 08:00 valeriegarcia12
Sn is the sum of the first n terms
To find the sum of the terms of an arithmetic sequence, you can use the
following formulae:
A. If the first and last terms are
given:
Sn=n(A1+An)÷2
where:
Sn is the sum of the first n terms
A1 is the first term
An is the last terma
B. If the last term is not given:
Sn=n[2a+ d(n-1)]÷2
where:
Sn is the sum of the first n terms
A1 is the first term
d is the common difference
Can you prove these formulae?
One way to prove thee formulae is to use mathematica induction.
Answers: 2
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Sn is the sum of the first n terms
To find the sum of the terms of an arithmetic sequence, you can...
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