The 1st term and the last term of an arithmetic progression are 15 and 20, respectively. The

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The 1st term and the last term of an arithmetic progression are 15 and −20,
respectively. The sum of all the terms is −40.
Work out how many terms there are in the
arithmetic progression.

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Complete Pure Mathematics 1 For Cambridge International AS & A Level

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Authors: Jean Linsky, Brian Western, James Nicholson

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Question Posted: Apr 14, 2023 10:28 AM

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The 1st term and the last term of an arithmetic progression are 15 and 20, respectively. The

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Let the first term of the arithmetic progression be a and the common differenc...View the full answer

Complete Pure Mathematics 1 For Cambridge International AS & A Level

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