Question

the basic series of preferred numbers are​

Answer 1

Answer:

The ISO has defined four basic series of preferred numbers: R5: 10, 16, 25, 40, 63, 100.

The basic series of preferred numbers are, R5, R10, R20, R40 and R80.

Answer 2

Answer:

The ISO has four basic series of preferred number are RS 10,16,25,40,63,100.