electronics subject!!.. pls help..?

1. what are the two ways that must be done on a three-input OR gate for it to function as a two-input OR gate?

2. what are the two ways that must be done on a three-input AND gate for it to function as a two-input AND gate?

3. what is the equivalent of a floating input of a TTL AND gate?

i've done some reseach in google, yahoo.. etc.. but i really cant find one.. pls help.. thanks!!..
 
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