zero,running and stopped boolean expression

How can I use the formula =SUMIF(...) + iF (...)?

Thanks for your help! I Have one more question. How can I have the user enter a number for a max amount of duplicates? For example, if the user enters 3 for this value then the prgram will remove any duplicates that occur three or more times. Same requirements apply.

I want solution with steps

Give the steps to eliminate useless symbols?

What do you mean by looping statements? Why looping statements are required? Explain with the help of example.

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answer qestions 3 , 4 and 5 please please

Why is it easier (in run time) to satisfy Disjunctive Normal Form (DNF) than Conjunctive Normal Form (CNF) even so CNF can be converted to DNF?

The debugging procedure has been performed but the problem has not been resolved. What can you do at this point?

Make a presentation on Looping and types of variables.