What is the value of the following expression: $1 - 3 + 5 - 7 + 9 - \cdots - 43 + 45 - 47 + 49$ ?
Question:
What is the value of the following expression: $1 - 3 + 5 - 7 + 9 - \cdots - 43 + 45 - 47 + 49$ ?
Answer:
Let's think step by step.

user
25
What is the value of the following expression: $1 - 3 + 5 - 7 + 9 - \cdots - 43 + 45 - 47 + 49$ ?
train