Arithmetic Progressions
NIOS · Class 10 · Maths
Quick revision notes for Arithmetic Progressions — NIOS Class 10 Maths. Key concepts, formulas, and definitions for last-minute revision.
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1. Identifying an Arithmetic Progression
- An AP has a fixed difference between consecutive terms.
- The standard form is a, a + d, a + 2d, a + 3d, ...
- The common difference is found by subtracting consecutive terms.
2. General Term of an AP
- The nth term gives any term of the AP directly.
- The general term is useful when the term number is known.
- The formula works for any positive integer n.
3. Finding Unknown Terms, a, or d
- If a and one term are known, d can be found.
- If d and one term are known, a can be found.
- If two terms are known, form two equations using t_n = a + (n - 1)d.
4. Sum of First n Terms
- The sum of an AP is found much faster by formula than by adding all terms one by one.
- Gauss’s pairing method leads to the sum formula.
- The formula can be written using a and d, or using the last term l, or using t_n.
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