Question

the fourth term from the end of ap -11,-8,-5......49 is

Answer 1

Answer:

an=49

a=-11

d=-8-(-11)=3

an=a+(n-1)d

49=-11+(n-1)3

49+11=3n-3

60+3=3n

63/3=n

21=n

Therefore there are 21 terms in the A.P

The fourth term from last will be the 18th term from first.

a18=a+(18-1)d

=-11+17d

=-11+17(3)

=-11+51

=40

a18=40

Therefore fourth term from the end of the A.P is 40

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