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