1.

What is the arithmetic mean between a2 and b2 ?

A. ( frac {1}{2} ) (a b)
B. ( frac {1}{2} ) (a + b)
C. ( frac {1}{2} ) (a<sup>2</sup> b<sup>2</sup>)
D. ( frac {1}{2} ) (a<sup>2</sup> + b<sup>2</sup>)
Answer» E.


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