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Answer:
4.
Step-by-step explanation:
(√11-√7)(√11+√7) is in the form of (a+b) (a-b)
(a+b)(a-b) = a² - b²
(√11-√7)(√11+√7)
=> (√11)² - (√7)²
=> 11 - 7
=> 4.
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