Question

find the sum of two middle terms of the AP.: -4/3,-1,-2/3,-1/3,...,13/3​

Answer 1

-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 middl 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.

Answer 2

Answer:

17 is the best answer Mark