The minimum resistance value for a blue, gray, red, silver resistor is
612 Ω
6,120 Ω
6,800 Ω
6,460 Ω
Correct answer is B
Because of 10% tolerance(last color silver), this resistance may vary 10% of 6800.
Minimum resistance value = 6800 - 680 = 6120
Maximum resistance value = 6800 + 680 = 7480