The sequence of coloured bands in two carbon resistors `R_1` and `R_2` is (i) brown, green, blue and (ii) orange, black, green. Find the ratio of their resistances.

Explanation

As per colour code followed resistance of
(i) Resistor `R_1` having brown, green and blue bands is `R_1 = 15 xx 10^6 Omega`
(ii) Resistor `R_2` having orange, black and green bands is `R2 = 30 xx 10^5 Omega`
`R_1/R_2 = (15 xx 10^6)/(30 xx 10^5) = 5/1`