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1.7.4 Arithmetic sequences and series (A-level only)

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Question 10

The fifth term of an arithmetic series is 21 and the sum of the first ten terms of the series is 245.

a.

Find the first term of the series.

[2]
b.

Find the common difference.

[2]
c.

Find the highest value of n n\,n for which the sum of the first n n\,n terms is less than 1000.

[6]

1.7.4 Arithmetic sequences and series (A-level only) Questions

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  3. /1.7.4 Arithmetic sequences and series (A-level only)