Correct answers only ! this is the last day to complete this assignment and i desperately need to finish this assignment with an 100%.

The option "C (7,999,999)" is correct.

Step-by-step explanation:

To find the total possible phone numbers just multiply the total number of possible options in each category

i.e. there are total 7 categories

--> one category = A

--> one category = B

--> one category = C

--> four categories = X

NOW the possible options in category A are from 2-9 (as given)

THUS count the numbers from 2 to 9 which are 2, 3, 4, 5, 6, 7, 8 & 9 and are 8 options

Similarly in category B (0-9) are 10 options

and in this way in all the remaining categories (C and Xs) are also 10, 10 options

SO

you have to write 8 in place of A and 10 in place of all other categories

i.e. 8,10,10, 10,10,10,10

THEN multiply all these

I.e. 8×10×10 ×10×10×10×10

= 8,000,000

NOW there is also an exception of one number that is given as 867-5309

So SUBTRACT one from the above figure i.e.

total possible phone numbers = 8,000,000 - 1 = 7,999,999

answer: r there any options?

step-by-step explanation: