+0  
 
+1
233
1
avatar+549 

If a/b is the probability that the reciprocal of a randomly selected positive odd integer less than 2010 gives a terminating decimal, with a and b being relatively prime positive integers, what is a+b?

 Jul 30, 2019
 #1
avatar+6186 
+2

\(\dfrac a b = \dfrac{\text{# of powers of 5 from 1-2010}}{\text{# of odd integers from 1-2010}}\\~\\ \text{I leave you to figure out those numbers}\)

.
 Jul 30, 2019

20 Online Users