1.

If \(\sqrt {10 - 2\sqrt {21} } + \sqrt {8 + 2\sqrt {15} } = \sqrt a + \sqrt b ,\) where a and b are positive integers, then the value of √(ab) is closet to:

A. 4.6
B. 5.9
C. 6.8
D. 7.2
Answer» C. 6.8


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