The 1st term and the last term of an arithmetic progression are 15 and 20, respectively. The
Question:
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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Let the first term of the arithmetic progression be a and the common differenc...View the full answer
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Related Book For
Complete Pure Mathematics 1 For Cambridge International AS & A Level
ISBN: 9780198427438
2nd Edition
Authors: Jean Linsky, Brian Western, James Nicholson
Question Posted:
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