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3 and 4 please would really help me helppp

3 and 4 please would really help me helppp-example-1

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3. (a) false
(b) true
(c) true
(d) false
4.________________________________
|Negative Sum|Zero Sum|Positive Sum|
| D & E | B & F | A & C |
|_______________________________|
User Stoinov
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