Formula deep page
Sum Using Last Term
Sₙ = n/2 (a + l)
This formula belongs to the chapter "Arithmetic Progressions" in Class 10 Mathematics. Use it after identifying the right variables, matching the chapter context, and writing the substitution clearly.
How to use it
- Identify the quantity you need to find.
- Check the related variables and units from the question.
- Substitute values carefully into the formula.
- Simplify step by step and write the final statement.
Worked cue
If first term is 5, last term is 25 and n = 5, sum = 75