PRC-2 · Chapter 3 · Question 12 of 45
The first and last terms of an arithmetic progression with exactly three terms are X and -X respectively. What is the common difference?
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: B) -X
Explanation
If the terms are X, a2, and -X. The common difference 'd' can be stated as d = a2 - X and d = -X - a2. Adding them gives 2d = -2X, meaning d = -X.
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