Summit

Prove that the sum from t=0 to m of (-1)^t/t!(m-t)! is zero.
Exploring and noticing Working systematically Conjecturing and generalising Visualising and representing Reasoning, convincing and proving
Being curious Being resourceful Being resilient Being collaborative


Prove that the sum

$$ \sum_{t=0}^m {(-1)^t\over t!(m-t)!} = 0 $$