the 9th term is equal to 499 and 499th term is equal to 9
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we will make two equations
a9=499
a+8d=499—(1)
a499=9
a+498d=9—(2)
subtracting the equations
a+8d=499
- (a+498d=9)
the will change of the opening the bracket because of negative sign
a+8d=499
-a-498d=-9
= -490d=490
d=-1
put the value of d in any of the equations and form the ap
the ap formed is 507, 506, 505, 504, ............9
OR
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