(a) Find the nth term of the sequence 5.2. - 1. - 4.-7....
(5) Find the 20th 25th and the terms of the A.P. given by 21. 16. 11.6, 1. - 4.-9....
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answer:-
a. first term=5
common difference=2-5=-3
for finding nth term we need last term
I conclude last term as -40
an=a+(n-1)d
-40=5+(n-1)-3
(n-1)-3=-45
n-1=-45/-3
n-1=15
n=15+1=16
b. first term =21
common difference=16-21=-5
25th term=a+24d
=21+24(-5)=21-120= -99
20th term=a+19d
=21+19(-5)=21-95=-74
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