Question

find the middle term of A.P. 19,16,13,10....-53

Answer 1

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Answer 2

Step-by-step explanation:

here a is 19

d is 16-19= -3

an is -53

an= a+(n-1)-3

-53=19+(n-1)-3

-53=19-3n+3

-53=22-3n

-53-22=-3n

-75=-3n

-75/-3=n

n=25