# Math Multiple Choice

If is defined for all positive numbers *a* and *b* by *a* *b* = , then

10 2 =

- (A) CORRECT ANSWER
- (B)
- (C) 5
- (D)
- (E) 20

##### Explanation:

Substituting 10 for *a* and 2 for *b* in the expression yields

The correct answer is (A).

(from the October 18, 1997 test)