13. a) Let's take two call bells and mark them as A and B. Now, let's do the following activities and answer the given questions. (i) Let's ring both the bells at a time and see at what time you rang the bell. (ii) Then, ring bell A after each interval of 2 minutes and bell B after each interval of 3 minutes. In this way, after how many minutes do you ring both the bells at a time? (iii) Again, ring bell A in every 4 minutes intervals and bell B in every 6 minutes intervals. In this way, after how many minutes do you ring both the bells at a time? Now, did you understand one of the uses of L.C.M. in our real life situations? ​