Points mark down
- (1,7)
- (2,5)
- (3,3)
- (4,1)
- (5,-1)
So
This is an arithmetic sequence having common difference 2
Recursive formula is
[tex]\\ \rm\rightarrowtail a_n=a_{n-1}-2[/tex]
Explict formula:-
[tex]\\ \rm\rightarrowtail a_n=a+(n-1)d[/tex]
[tex]\\ \rm\rightarrowtail a_n=7-2(n-1)[/tex]
