Question

find the 20^th term from the last of the AP 3,8.........253​

Answer 1

Answer:

a=3

d=5

total terms is 253=3+(n-1) 5

n=51

20th term from last is 32th term from starting

then

=3+31×5

=158

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Answer 2

Answer:

158

Step-by-step explanation:

Here a=253

d=3-8=-5. [because we have to find from last so that's why we take 3-8]

and n=20

an=a+(n-1)d

a20=253+(20-1)×-5

a20=253+19×-5

a20=253-95

a20=158

therefore 20th term from the last of the AP is 158.