Question

The mobile numbers of a telecom company begin with the digits 932 and do not end in 9. How many phone numbers can it provide at the most?

Answer 1

Answer: 9000000

Step-by-step explanation:

there are 10 digits in mobile number

the mobile number telecom company begins with digits 932 and don't end 9

so possible mobile number is

932xxxxxxy

there are possible 10 digits for the value of x = 0,1,2,3,4,5,6,7,8,9

don't end with 9 so value of y =0,1,2,3,4,5,6,7,8 here 9 possible digits,

total at most mobile numbers provided by telecom company

= 10 * 10 * 10 * 10 * 10 * 10 * 9

= 9000000