Question

Find the 8th term from the end of the ap: 7,10,13,....181

Answer 1

x=7

d=10-7=3

So,

x8=x+7d

=7+21

=28

So the 8th term is 28......

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Answer 2

l=181

n=8

d=10-7=3

nth term from the end = l-(n-1)d

8th term from the end =181-(8-1)3

=181-21

=160