I
@ Which term of sequence 4. 9. 14. 19. ...is 104
m/Which term of the sequence 21. 18. 15. ...is -81
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First case 4,9,14,19.........,104
An=104 a=4 d=5
An=a+(n-1)d
104=4+(n-1)5
104=4+5n-5
104=-1+5n
105=5n
N=105/5
N=21
Case 2 - 21,18,15,.....,-81
A=21 an=81. D=-3
An=a+(n-1)d
-81=21+(n-1)x-3
-81=21-3n+3
-81=24-3n
-81-24=-3n
-105=-3n
N=-105/-3
N=35
An=104 a=4 d=5
An=a+(n-1)d
104=4+(n-1)5
104=4+5n-5
104=-1+5n
105=5n
N=105/5
N=21
Case 2 - 21,18,15,.....,-81
A=21 an=81. D=-3
An=a+(n-1)d
-81=21+(n-1)x-3
-81=21-3n+3
-81=24-3n
-81-24=-3n
-105=-3n
N=-105/-3
N=35
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