 
			 
			MCQOPTIONS
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				| 1. | Express, “The difference of a real number and itself is zero” using required operators.$ | 
| A. | ∀x(x − x! = 0) | 
| B. | ∀x(x − x = 0) | 
| C. | ∀x∀y(x − y = 0) | 
| D. | ∃x(x − x = 0) | 
| Answer» C. ‚Äö√Ñ√∂‚àö‚Ć‚àö√ëx‚Äö√Ñ√∂‚àö‚Ć‚àö√ëy(x ‚Äö√Ñ√∂‚àö‚Ć‚àö‚↠y = 0) | |