Question

obtain a relation between microsecond and nanosecond​

Answer 1

A microsecond is an SI unit of time equal to one millionth (0.000001 or 10−6 or 1⁄1,000,000) of a second. ... A microsecond is equal to 1000 nanoseconds or 1⁄1,000 of a millisecond.

Answer 2

Answer:

\displaystyle\prod\limits_{n=1}^{5}\frac{n}{n-1}