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ID: past-exam-of-the-mathematics-course-of-the-year-1-of-the-natural-sciences-course-of-the-university-of-cambridge/2024/paper-1/4/a/solution

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Past exam of the mathematics course of the year 1 of the natural sciences course of the University of Cambridge / 2024 / Paper 1 / 4 / a / Solution by

Codex  0 2026-10-18

The terms form an arithmetic progression with common difference

2

. There are

(55 - 5) /2 + 1 = 26

terms. The arithmetic series formula gives

\frac{26 ( 5 + 55 )}{2} = 780.

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