hello I need your help with these true-false question and explaining why is true

Question

hello I need your help with these true-false question and explaining why is true and why is false in short answer :

1- when connecting the 7 segment LED using common anod configuration the LED pins must be changed to the LOW for them to light up.

2- counter=counter%8(modulo8) will ensure the counter variable doesn't exceed 8 by returning 'counter' back to zero thereby providing wrap-around functionality.

3- when a diode is connecting to a voltage source a resistor should always be used in series to limit current.

Explanation / Answer

Solution 1:

1) True, because  In the common anode display, all the anode connections of the LED segments are joined together to logic '1'.The individual segments are illuminated by applying a ground, logic “0” or “LOW” signal via a suitable current limiting resistor to the Cathode of the particular segment.

2) True: because modulo 8 counter rolls back to zero by changing 8 states (from 0 to 7).

3) True: Resistor is always required to linit the current when the diode is forward biased because the drop across the diode is constant and the current passing through the diode should not exceed the maximum forward rating current. So, current limiting resistor is always required.

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