In some cultures the number “8” is considered lucky and people want it in their telephone
number. If a country uses 7 digit telephone numbers where the first digit is not zero or one, how
many 7 digit telephone numbers are possible that contain at least two “8”s?

Question

In some cultures the number “8” is considered lucky and people want it in their telephone 
number. If a country uses 7 digit telephone numbers where the first digit is not zero or one, how 
many 7 digit telephone numbers are possible that contain at least two “8”s?

anonymous · Answer

I am confuesed on what you need help with

anonymous · Answer

its simple

anonymous · Answer

just use logic

anonymous · Answer

write down the cases with no 0 or 1 in first place

anonymous · Answer

this is permutation combination right?

anonymous · Answer

^ yes

anonymous · Answer

is repetition allowed

anonymous · Answer

yes, and the answer is between 1 million and 2 million

anonymous · Answer

oh! thatll be difficult for me to calculate here by the way how far have you gone
?

anonymous · Answer

Sorry, actually its nighttime here and i am on my laptop with no copy pen!!

anonymous · Answer

and its dark

anonymous · Answer

Can I have a medal

anonymous · Answer

??

anonymous · Answer

so this is how i am visualizing it right now.

|dw:1362688661329:dw|

8 possibilities for the first one, 10 for all the rest.