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Which of the following is smallest?

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Which of the following is smallest?
1. \(\sqrt 9 - \sqrt 7 \)
2. \(\sqrt 6 - \sqrt 4 \)
3. \(\sqrt {28} - 5\)
4. \(\sqrt {18} - 4\)
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Correct Answer - Option 4 : \(\sqrt {18} - 4\)

Calculation:

√9 - √7 = 3 - 2.64 = 0.36

√6 - √4 = 2.44 - 2 = 0.44

√28 - 5 = 5.29 - 5 =  0.29

√18 - 4 = 4.24 - 4 = 0.24

∴ √18 - 4 is the smallest.

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