GOODMAN
How many 7 digit phone numbers can be formed if the first digit cannot be 0 or 1?
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imranmeah91
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well, let's write out each posibility for each digit and then multiply
GOODMAN
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I was told to use the Counting Principle
imranmeah91
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first one can't be 0 or 1 , so we got only 8 possibilities
RyanE
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8*10*10*10*10*10*10
imranmeah91
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the other digits have 10 possibilties so we multiplies them all
GOODMAN
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Okay, so we delete 2 outta the 10 possibliity.
imranmeah91
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like Ryan did above
lgbasallote
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you're not planning on stalking someone are you @GOODMAN /:) he
GOODMAN
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Wait, how do we know that the others have 10 possibilities, doesnt it apply to the others as well?
lgbasallote
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jk goodie :DDD
imranmeah91
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well, only first digit can't be 0 or 1 ; other digits can be any number from 0 to 9
GOODMAN
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Ohhh, okay, got it!
GOODMAN
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I need help with one more if you dont mind..
GOODMAN
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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?
imranmeah91
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@satellite73
anonymous
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yes?
imranmeah91
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little help with photographer problem
anonymous
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ok ____, ___, ____, B G ____, ____, _____
anonymous
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\[6!\]
GOODMAN
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Thats it?
imranmeah91
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yep
GOODMAN
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How?
anonymous
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that looks right to me
agreene
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what all of a sudden this has to be in base 10?
anonymous
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this might surprise you and this might amaze you
anonymous
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but i am going to knock out joe frazier !
GOODMAN
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Huh?
anonymous
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btw it is
\[6!=6\times 5\times 4\times 3\times 2=720\]
GOODMAN
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Yea, i knw what factorials are, but whats is Joe Frazier got to do with this, lol.
anonymous
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Float like a butterfly, sting like a bee
anonymous
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His hands can't hit what his eyes can't see.
lgbasallote
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he beat muhammad ali....
GOODMAN
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Hahaha, thats nice.