94. Even or odd number

$$
1-2+3-4+5-6+\ldots+993 ?
$$
$\triangle$ Based on the statement of problem 93, the difference $1-2$ has the same parity as the sum $1+2$, the difference $3-4$ has the same parity as the sum $3+4$, and so on. Therefore, the given sum has the same parity as the sum

$$
1+2+3+4+5+6+\ldots+993
$$

We can reason further in the same way as in the solutions to problems 83 and 84. Out of the 993 addends in the last sum, 496 are even and 497 are odd, hence this sum is odd.

Answer: odd.