Solution:

The given AP is: 10,7,4,….., -62
So, the first term is a = 10
And the common difference is d = 7 – 10 = -3
Suppose that there are n terms in the given AP. Then, we can write:

Thus, we can say that the given AP contains 25 terms.
And the middle term of the given AP is given as follows:

Hence, the middle term of the given AP is -26