To determine which of the given options is a rational number between 5 and 5¾ (which is 5.75), we can analyze each option.
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√26: This is approximately 5.099, which is less than 5.75 but greater than 5. So this option is a rational number between 5 and 5.75.
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51/8: This equals 6.375, which is greater than 5.75.
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52/5: This equals 10.4, which is also greater than 5.75.
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51/3: This equals approximately 17, which is also greater than 5.75.
The only option that is a rational number between 5 and 5.75 is √26.