Explain with a brief reason whether knowing that the 7th term of an arithmetic…

MATHEMATICS · Subjective · A Level · Mathematics · Sequences and series · Sequences and series

Problem

Explain with a brief reason whether knowing that the 7th term of an arithmetic progression (AP) is 19 and the sum of its first 7 terms is 70 is enough to determine the first term and the common difference of the AP uniquely.

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