f(x)=x(x_ 1)(x_ 2)… (x_ 99)(x_ Find the derivative of F (0)

f(x)=x(x_ 1)(x_ 2)… (x_ 99)(x_ Find the derivative of F (0)


Using the derivative rule of compound function
f(x)=x(x_ 1)(x_ 2)… (x_ 99)(x_ 100)
f'(x)=(x_ 1)(x_ 2)… (x_ 99)(x_ 100)+x(x_ 2)… (x_ 99)(x_ 100)+x(x_ 1)… (x_ 99)(x_ 100)+...+x(x_ 1)(x_ 2)… (x_ 99)
So f '(0) = 100!