Question

Find the value of middle most term (s) of the ap :--11,-7,-3,........,49

Answer 1

Answer:

the middle most term of A.P is 13.

Step-by-step explanation:

first find no. of terms

a=-11, d=-7-(-11)=4

an=49. then an = a + (n-1)d

49 = -11 + (n-1)4

49 +11 = (n-1)4

60÷4= n-1

15+1 =n

n =16.

Now, middle term is 8th term.

a8 = a+ 7d.

a8 = -11 +7× 4

= -11+28

= 17