Case Study-2 : In our daily life we all see traffic lights. A traffic controller set the timings of traffic lights is such a way that all light are not green at the same time or specially not in the rush hout. It may create problem in an hour because lights are for few minutes only. So, he take the timmings of nearby places in same area and calculate I cm of all traffic stops and he easily manage the traffic by increasing the duration set at different times. There are two traffic lights on a particular highway which shows green light at the interval of 90 seconds and 144 second respectively.
Read the above paragraph carefully and answer the questions that follows:
Identify the correct option:

Options

A. `HCF (a,b)xxLCM (a,b)=a/b`
B. `(HCF(a,b))/(LCM (a, b))=a/b`
C. `HCF (a,b)xxLCM (a,b)=a-b`
D. `HCF(a,b)xxLCM(a, b)=ab`

Answer

D