### Home > PC > Chapter 6 > Lesson 6.3.1 > Problem 6-115

6-115.

What expression would change the sign back and forth (+ to −)?

(−1)^{n}*n* is an integer.

What expression gives odd numbers?

2*n* + 1

6-115.

What expression would change the sign back and forth (+ to −)?

(−1)^{n}*n* is an integer.

What expression gives odd numbers?

2*n* + 1