Digital Electronics
The implicants which will definitely occur in the final expression are called

 prime implicants
 selective prime implicants
 redundent prime implicants
 essential prime implicants

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Digital Electronics
In case of OR gate, no matter what the number of inputs, a

1 at any input causes the output to be at logic 0
0 any input causes the output to be at logic 0
0 at any input causes the output to be at logic 1.
1 at any input causes the output to be at logic 1

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