Zeno's Paradox (Geom Series)
Infinitely many halves still add up to exactly 1.
to infinity = 1
Walk half the way to the wall: half the distance is behind you, half ahead.
Each step halves what is LEFT. After four steps, only one sixteenth remains.
The gap is always , and no number is smaller than every one of those.
Your turn
Three to try in your head — tap what you get.
Sum from k=1 to 5
Sum from k=1 to 4
Sum from k=1 to 6
All 36 shortcuts: the Magic Tricks library.