Find the 20 th term from …
CBSE, JEE, NEET, CUET
Question Bank, Mock Tests, Exam Papers
NCERT Solutions, Sample Papers, Notes, Videos
Posted by Vishawanath Gadaraddi 5 years, 6 months ago
- 1 answers
Test
Related Questions
Posted by Sahil Sahil 1 year, 3 months ago
- 2 answers
Posted by Kanika . 1 week ago
- 1 answers
Posted by Hari Anand 5 months, 2 weeks ago
- 0 answers
Posted by Parinith Gowda Ms 2 months, 3 weeks ago
- 1 answers
Posted by Vanshika Bhatnagar 1 year, 3 months ago
- 2 answers
Posted by Parinith Gowda Ms 2 months, 3 weeks ago
- 0 answers
myCBSEguide
Trusted by 1 Crore+ Students
Test Generator
Create papers online. It's FREE.
CUET Mock Tests
75,000+ questions to practice only on myCBSEguide app
Yogita Ingle 5 years, 6 months ago
Given series is 3, 8, 13, ...... 253
here, first term , a = 3
common difference , d = 5
Let us find total number of terms at first.
use {tex}\bf{T_n=a+(n-1)d}{/tex}
=> 253 = 3 + (n - 1)5
=> 250 = 5(n - 1)
=> n - 1 = 50
=> n = 51
so, there are 51 terms in given series.
now we know, mth term from last =last term - mth term + 1
so, 20th term from last = 51 - 20 + 1 = 32
hence, 20th from last = 32th term from first
use , {tex}\bf{T_{32}=a+(32-1)d}{/tex}
= 3 + 31 × 5 = 3 + 155 = 158
hence , 20th term from last = 158
2Thank You