Find the equivalent resistance of the combination of resistors R 1 ​ =42.0Ω,R 2 ​ =75.0Ω,R 3 ​ =33.0Ω,R 4 ​ =61.0Ω, R 5 ​ =12.5Ω, and R 6 ​ =27.0Ω shown in the figure.