Question

how many systems of units are there ? a) 2 b) 3 c) 4 d) 5​

Answer 1

Answer:

5 is your answer dear friend.........

Answer 2

The SI system, also called the metric system, is used around the world. There are seven basic units in the SI system: the meter (m), the kilogram (kg), the second (s), the kelvin (K), the ampere (A), the mole (mol), and the candela (cd).