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@ASAAD123 can hlp
you have 1AB2 and 1CD5
A,B,C,D are all somewhere in 0,...9
can you take it from there?
can't give answers!
can i solve it by scientific calc
how many ways to choose A, then for each A you choose, how many ways to pick B repeat for C,D
by npr or ncr
you can do it in your head if you know how to do it
but really, it's easier than that
how i do it by ncr
you have 10 ways to choose A, right?
ie you don't need it
then once you have chosen A, you have 10 ways to choose B
@ASAAD123 's drawing is a really nice clue
i want to do it by calc how
can u tell me
you don't need a calc, you need think about the problem.
i can solve it by think but i want to know how to do it by calc
bec think take alot of time
can u hlp
by calc ncr or npr and how
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
i need to know how to do it by ncr or npr can u hlp
and why (0-9)
can u tell me how to do it by ncr or npr@IrishBoy123
@ganeshie8 can u hlp
\[1C1 \times 10C1 \times10C1\times 2C1\]
ok thank u @ASAAD123
ok but why u do(0-9) why not(0-8) or any thing like this
0 is neither negative nor positive. sometimes is is counted as positive
ok but why u use 9 not other digit
there are only 10 digits (0,1,2,3,4,5,6,7,8,9)
ok why u chose 9 not 1 or 2 or 3or other digit
every number in the world is contained one or more of these digits.
for example: 1092 1912 1475
u chose 9 bec it is the end of the numer right or wrong
the end of digits
bec the numbers start from 0 to 9
ok digits from 0 to 9 rihgt or wrong
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
@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.