find the value of the middle most term of the ap -15,-11.......53
Answers & Comments
Anshika0402
-15,-11.....53 d = -11-(-15) = -11+15 = 4 d=4 L/aⁿ = a+(n-1)d 53= -15 + (n-1)4 53+15 = 4n-4 68+4 = 4n 72/4 = n 18 = n we have to find the value of the middle term. so n/2 = 18/2 = 9th term will be the middle term 9th term = a+(9-1)d = -15+ (8)4 = -15+32 = 17 So, the answer is 17.
Answers & Comments
d = -11-(-15) = -11+15 = 4 d=4
L/aⁿ = a+(n-1)d
53= -15 + (n-1)4
53+15 = 4n-4
68+4 = 4n
72/4 = n
18 = n
we have to find the value of the middle term. so n/2 = 18/2 = 9th term will be the middle term
9th term = a+(9-1)d = -15+ (8)4 = -15+32 = 17
So, the answer is 17.
hope it helps.. :)