i need help with this one!

A 100KHz oscillator that's followed by a doubler and two triplers will produce an output of frequency....

a.) 180 kHz
b.) 500 "
c.) 800 "
d.) 1.8 "

2 answers

If all are in kHz, no anwer. If d is in Ghz...

100*2*3*3=
I couldn't get one of the available answers, either.