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So common difference =d= 8 - 3 = 5

last term = a = 253

n = 20

so using nth = a - (n - 1)d

⇒ x = 253 - 19 x 5

⇒ x = 158

last term = a = 253

n = 20

so using nth = a - (n - 1)d

⇒ x = 253 - 19 x 5

⇒ x = 158

__ANSWER__### This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.

From given data a=3, d= 8-3=5, l=253

l=a+(n-1)d

253=3+(n-1)5

n-1=253-3/5

n-1=50

n=50+1=51

there are 51 numbers in the series

the 20th term from the last will be 32nd term (note that it will not be the 31st term)

so, a32=3+(32-1)5

= 3+(31)5

= 3+155

= 158

therefore the 20th term from the last is 158

l=a+(n-1)d

253=3+(n-1)5

n-1=253-3/5

n-1=50

n=50+1=51

there are 51 numbers in the series

the 20th term from the last will be 32nd term (note that it will not be the 31st term)

so, a32=3+(32-1)5

= 3+(31)5

= 3+155

= 158

therefore the 20th term from the last is 158