find the 20 th term from the last term of the AP 3, 8, 13,....... 253
kavya6699:
thank you
Answers
Answered by
3
Answer:
!!
Step-by-step explanation:
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
=> 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 ,
= 3 + 31 × 5 = 3 + 155 = 158
hence , 20th term from last = 158
..
Answered by
5
Heyy Buddy
Here's your Answer
To find the 20th term from the last,
Take a = 253
and d = 3 - 8 = -5
=> d = -5.
Now,
a 20 = a + 19d
=> 253 +19 × (-5)
=> 253 - 95
=> 158.
✔✔✔
Here's your Answer
To find the 20th term from the last,
Take a = 253
and d = 3 - 8 = -5
=> d = -5.
Now,
a 20 = a + 19d
=> 253 +19 × (-5)
=> 253 - 95
=> 158.
✔✔✔
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