anonymous
  • anonymous
counting question
Mathematics
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anonymous
  • anonymous
counting question
Mathematics
katieb
  • katieb
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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anonymous
  • anonymous
anonymous
  • anonymous
@ASAAD123 can hlp
IrishBoy123
  • IrishBoy123
you have 1AB2 and 1CD5

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IrishBoy123
  • IrishBoy123
A,B,C,D are all somewhere in 0,...9
IrishBoy123
  • IrishBoy123
can you take it from there?
IrishBoy123
  • IrishBoy123
can't give answers!
anonymous
  • anonymous
|dw:1441103308403:dw|
anonymous
  • anonymous
can i solve it by scientific calc
IrishBoy123
  • IrishBoy123
how many ways to choose A, then for each A you choose, how many ways to pick B repeat for C,D
anonymous
  • anonymous
by npr or ncr
IrishBoy123
  • IrishBoy123
you can do it in your head if you know how to do it
IrishBoy123
  • IrishBoy123
nCr
anonymous
  • anonymous
IrishBoy123
  • IrishBoy123
but really, it's easier than that
anonymous
  • anonymous
how i do it by ncr
IrishBoy123
  • IrishBoy123
you have 10 ways to choose A, right?
anonymous
  • anonymous
|dw:1441103482580:dw|
IrishBoy123
  • IrishBoy123
\[C_{1}^{10}\]!!
IrishBoy123
  • IrishBoy123
ie you don't need it
IrishBoy123
  • IrishBoy123
then once you have chosen A, you have 10 ways to choose B
IrishBoy123
  • IrishBoy123
@ASAAD123 's drawing is a really nice clue
anonymous
  • anonymous
i want to do it by calc how
anonymous
  • anonymous
can u tell me
anonymous
  • anonymous
you don't need a calc, you need think about the problem.
anonymous
  • anonymous
i can solve it by think but i want to know how to do it by calc
anonymous
  • anonymous
bec think take alot of time
anonymous
  • anonymous
can u hlp
anonymous
  • anonymous
by calc ncr or npr and how
anonymous
  • anonymous
for the first digit, you have 1 way (1), for second and third digit you have 10 ways(0-9), and for last digit you have 2 ways (2 or 5). then use product rule. that's it
anonymous
  • anonymous
i need to know how to do it by ncr or npr can u hlp
anonymous
  • anonymous
and why (0-9)
anonymous
  • anonymous
can u tell me how to do it by ncr or npr@IrishBoy123
anonymous
  • anonymous
anonymous
  • anonymous
@ganeshie8 can u hlp
anonymous
  • anonymous
\[1C1 \times 10C1 \times10C1\times 2C1\]
anonymous
  • anonymous
ok thank u @ASAAD123
anonymous
  • anonymous
ok but why u do(0-9) why not(0-8) or any thing like this
anonymous
  • anonymous
0 is neither negative nor positive. sometimes is is counted as positive
anonymous
  • anonymous
ok but why u use 9 not other digit
anonymous
  • anonymous
there are only 10 digits (0,1,2,3,4,5,6,7,8,9)
anonymous
  • anonymous
ok why u chose 9 not 1 or 2 or 3or other digit
anonymous
  • anonymous
every number in the world is contained one or more of these digits.
anonymous
  • anonymous
for example: 1092 1912 1475
anonymous
  • anonymous
u chose 9 bec it is the end of the numer right or wrong
anonymous
  • anonymous
the end of digits
anonymous
  • anonymous
bec the numbers start from 0 to 9
anonymous
  • anonymous
ok digits from 0 to 9 rihgt or wrong
anonymous
  • anonymous
ok mr asaad can u tell me why u 1*10*10*2 and what is the Relationship between this and (0-9) that u wrote it 2nd
anonymous
  • anonymous
anonymous
  • anonymous
hlp
mathmate
  • mathmate
@Nourage These nice people have been trying to help you do the counting, exactly as you posted "counting question". Be patient and listen to the explanations. Calculations come later, when you understand how you count. In counting as in ALL math problems, blindly applying a formula does not work. You need to understand the problem first, then try to understand HOW you want to solve the problem. Formulas are just tools to help you when you need it.

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