MATH EXPLAINER — RECURSION
TOTAL(4) — a function that calls itself
TOTAL(0) = 0
BASE CASE — AT ZERO, THE CALLS STOP.
TOTAL(1) = 1 + 0 = 1
TOTAL(2) = 2 + 1 = 3
TOTAL(3) = 3 + 3 = 6
TOTAL(4) = 4 + 6 = 10
= 10
EVERY RECURSION NEEDS A BASE CASE — OR IT NEVER STOPS