MathDB

8

Part of 2003 AMC 10

Problems(2)

Factors of 60

Source:

2/16/2008
What is the probability that a randomly drawn positive factor of 60 60 is less than 7 7?
<spanclass=′latex−bold′>(A)</span> 110<spanclass=′latex−bold′>(B)</span> 16<spanclass=′latex−bold′>(C)</span> 14<spanclass=′latex−bold′>(D)</span> 13<spanclass=′latex−bold′>(E)</span> 12 <span class='latex-bold'>(A)</span>\ \frac{1}{10} \qquad <span class='latex-bold'>(B)</span>\ \frac{1}{6} \qquad <span class='latex-bold'>(C)</span>\ \frac{1}{4} \qquad <span class='latex-bold'>(D)</span>\ \frac{1}{3} \qquad <span class='latex-bold'>(E)</span>\ \frac{1}{2}
probability
Geometric Sequence

Source:

1/4/2009
The second and fourth terms of a geometric sequence are 2 2 and 6 6. Which of the following is a possible first term? (A)\ \minus{}\!\sqrt3 \qquad (B)\ \minus{}\!\frac{2\sqrt3}{3} \qquad (C)\ \minus{}\!\frac{\sqrt3}{3} \qquad (D)\ \sqrt3 \qquad (E)\ 3
ratiogeometric sequence