Example 8 - Chapter 5 Class 10 Arithmetic Progressions
Last updated at April 16, 2024 by Teachoo
Finding nth term from end
Chapter 5 Class 10 Arithmetic Progressions
Concept wise
- Checking if AP or not and finding a, d
- Finding nth term
- Finding n
- Finding AP
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Finding nth term from end
- Divisible/ multiples
- Statement questions - nth term
- Finding sum of n terms
- Finding number of terms given s
- Given nth term finding s
- Statement questions - Sum of n terms
- Determining AP and finding sum
Transcript
Example 8 Find the 11th term from the last term (towards the first term) of the AP : 10, 7, 4, ..., – 62. Given AP 10, 7, 4, ………., –62 Now, 11th term from last term of AP 10, 7, 4, …. = 11th term of AP −62, −59, −56, ….7, 10 Thus, our AP is −62, −59, −56, ….7, 10 Here a = −62 d = −59 – (−62) = 3 We need to find 11th term n = 11 Now, an = a + (n – 1) d Putting values an = −62 + (11 – 1) × 3 an = −62 + 10 × 3 an = −62 + 30 an = −32 So the 11th term from the Last is –32
