Question

The first term of an arithmetic sequence is a1, the common difference is d. Write the formula:

For the nth term an
For the sum of the first three terms a1 +a2 +a3
For the sum of the first four terms a1 +a2 +a3 +a4
For the sum of the first five terms a1 +a2 +a3 +a4 +a5

For the sum of the terms from the mth term to the ntham +a(m+1) + … +a(n –1) +an

For the sum of the first nterms a1 +a2 + … + an

Answer 1

Answer:

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Answer 2

Answer:

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