Question

find the 20th term from the last term of AP :3,18,13...253​

Answer 1

Answer:

a=3,d=5

253=3+5(n−1)

Or, 5(n−1)=250

Or, n−1=50

Or, n=51

So, the 20th term from the last term =51−19=32nd term

Now, n

32

=3+5×31=158

Answer 2

Answer is in the attachment

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