Question

The number of numbers laying between 100 and 1000 can be formed with the degit 1 2 3 4 5 6 7​

Answer 1

Answer:

210

Explanation:

from 100 to 1000

I'm gonna assume its between 101 and 999 since 100 and 1000 aren't formed by those digits

So we will be taking numbers having no repetition.

First digit has 7 numbers available, so second digit has 6 numbers and third digit has 5 numbers available.

so total numbers are 7*6*5=210