By using the H.C.F, find the L.C.M of:

$1333, 1767$

The L.C.M of two even numbers is their product.

The L.C.M. of two numbers is always greater than either of numbers.

The LCM of two prime numbers is always their product.

If one of the two numbers is a factor of the other, then their L.C.M is always equal to the factor.

Multiple Choice Questions (M.C.Qs).

Which of the following is the L.C.M of $9, 14$ and $21$?

Three city tour buses leave the bus stop at $9.00 \mathrm{AM}$. Bus $\mathrm{A}$ returns every $30$ minutes, Bus $\mathrm{B}$ returns every $20$ minutes and Bus $\mathrm{C}$ returns every $45$ minutes. What is the next time, the buses will all return to the same time to the bus stop?

The least $5-$ digit number which is exactly divisible by $16, 24, 36$ and $54$ is