alleryIf the geometric mean of two positive numbers is 8, their product must be:
ASixty-two
BSixty-four
CSixty-nine
DSixty-five
Answer & Solution
Correct answer: B. Sixty-four
1. The geometric mean of a and b is the square root of their product.
2. Setting that equal to eight and squaring gives the product.
3. From the geometric mean of 8 we get that ab is 64.
4. So the product is sixty-four.
_Source: syllabus Mathematics, Ch 8 'Sequences and Series'_
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