Answer
7 times
Work Step by Step
factorial(6) returns 6*factorial(5)
factorial(5) returns 5*factorial(4)
factorial(4) returns 4*factorial(3)
factorial(3) returns 3*factorial(2)
factorial(2) returns 2*factorial(1)
factorial(1) returns 1*factorial(0)
factorial(0) returns 1
Total = 7 times
