Question

Plss help

7. (a) how many 3-digit positive numbers are there?
(b) how many 4-digit positive numbers are there?

Answer 1

Explanation:

A. a=100. an=999

an=a+n-1.d

Therefore answer will be 900.

B. 9000.

Answer 2

a) 900

b) 9,000

Explanation: