Question 9Starting from 1, Noah repeatedly multiplies by either 6 or 10. Which number can he not obtain?$2^{100}3^{20}5^{80}$$2^{90}3^{30}5^{80}$$2^{90}3^{20}5^{70}$$2^{110}3^{80}5^{30}$$2^{50}5^{50}$