Question

How many 7 digit phone numbers can be formed if the first digit cannot be 0 or 1?

Answer 1

well, let's write out each posibility for each digit and then multiply

Answer 2

I was told to use the Counting Principle

Answer 3

first one can't be 0 or 1 , so we got only 8 possibilities

Answer 4

8*10*10*10*10*10*10

Answer 5

the other digits have 10 possibilties so we multiplies them all

Answer 6

Okay, so we delete 2 outta the 10 possibliity.

Answer 7

like Ryan did above

Answer 8

you're not planning on stalking someone are you @GOODMAN /:) he

Answer 9

Wait, how do we know that the others have 10 possibilities, doesnt it apply to the others as well?

Answer 10

jk goodie :DDD

Answer 11

well, only first digit can't be 0 or 1 ; other digits can be any number from 0 to 9

Answer 12

Ohhh, okay, got it!

Answer 13

I need help with one more if you dont mind..

Answer 14

A photographer is taking a picture o f a bride and groom together with 6 attendants. How many ways can he arrange the 8 people in a line if hte bride and groom stand in the middle?

Answer 15

@satellite73

Answer 16

yes?

Answer 17

little help with photographer problem

Answer 18

ok ____, ___, ____, B G ____, ____, _____

Answer 19

\[6!\]

Answer 20

Thats it?

Answer 21

yep

Answer 22

How?

Answer 23

that looks right to me

Answer 24

what all of a sudden this has to be in base 10?

Answer 25

this might surprise you and this might amaze you

Answer 26

but i am going to knock out joe frazier !

Answer 27

Huh?

Answer 28

btw it is
\[6!=6\times 5\times 4\times 3\times 2=720\]

Answer 29

Yea, i knw what factorials are, but whats is Joe Frazier got to do with this, lol.

Answer 30

Float like a butterfly, sting like a bee

Answer 31

His hands can't hit what his eyes can't see.

Answer 32

he beat muhammad ali....

Answer 33

Hahaha, thats nice.