Question : What is the LCM of 0.15, 0.18, and 0.45?

Option 1: 0.9

Option 2: 0.09

Option 3: 0.81

Option 4: 0.6

Question : The mean proportional between 0.03 and 0.0003 is:

Option 1: 0.0003

Option 2: 0.0013

Option 3: 0.003

Option 4: 0.033

Question : Find the mean proportion of $x^3y$ and $xy^3$.

Option 1: $x^2y^2$

Option 2: $x^3y^3$

Option 3: $xy$

Option 4: $x^4 y^4$

Question : If the LCM of two numbers a and b is 60 and their HCF is 15. Determine their mean proportion.

Option 1: 30

Option 2: 25

Option 3: 60

Option 4: 4

Question : The mean of $x$ and $\frac{1}{x}$ is $N$. Then the mean of $x^2$ and $\frac{1}{x^2}$ is:

Option 1: $N^2$

Option 2: $2N^2-1$

Option 3: $N^2-2$

Option 4: $4N^2-2$