# Difference between revisions of "2006 AMC 12B Problems/Problem 1"

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<math>(-1)^n=1</math> if n is even and <math>-1</math> if n is odd. So we have | <math>(-1)^n=1</math> if n is even and <math>-1</math> if n is odd. So we have | ||

− | <math>-1+1-1+1- | + | <math>-1+1-1+1-\cdots-1+1=0+0+\cdots+0+0=0 \Rightarrow \text{(C)}</math> |

== See also == | == See also == | ||

* [[2006 AMC 12B Problems]] | * [[2006 AMC 12B Problems]] |