Range of current limiting resistor for LED lightening

Q.  What is the possible range of current limiting resistor essential for lightening the LED in certain applications after pressing the push-button?
- Published on 12 Nov 15

a. 25-55 Ω
b. 55-110 Ω
c. 110-220 Ω
d. 220-330 Ω

ANSWER: 220-330 Ω

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