Solution
= Solution
Pair adjacent terms in the finite <sum>:
$$
(-2+4)+(-6+8)+\cdots+(-98+100).
$$
There are $25$ pairs, each equal to $2$. The result is $\boxed{50}$.
= Solution
Pair adjacent terms in the finite <sum>:
$$
(-2+4)+(-6+8)+\cdots+(-98+100).
$$
There are $25$ pairs, each equal to $2$. The result is $\boxed{50}$.