For the timer program shown,output D is switched ON when: 
Definitions:
Simplify
Simplifying a mathematical expression or problem means breaking it down to its most basic form to make it simpler to understand or resolve.
Operation Indicated
The specific mathematical procedure or action suggested by a problem or equation.
Collect Like Terms
In algebra, to combine terms that have the same variables raised to the same power.
Simplify
To make (something) simpler or easier to understand or do.
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