# Question #18833

##### 1 Answer

#### Explanation:

The next time they will flash again will be

We can see that the LCM requires at least three factors of

As

Note that at that time, the first lighthouse will have flashed

Sep 15, 2016

The next time they will flash again will be

We can see that the LCM requires at least three factors of

As

Note that at that time, the first lighthouse will have flashed