Question

If r is an integer greater than 1, what is the value of (−1)^r +1 if:

1. r is an odd integer
2.r is an even integer

Answer 1

You can use trial and error to work this out.
Just sub in points
1. choose r to be odd and see what you obtain : )

Answer 2

(-1)^odd integer = -1
(-1)^even integer = +1

so you have either
-1 + 1 =
or
1 + 1=

Answer 3

thanks