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Mathematics 10 Online
crispyrat:

math help ss below

crispyrat:

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crispyrat:

@AZ

AZ:

how many ways did you find so far

crispyrat:

im having trouble starting e.e cus both the o's can be counted as first or last so im not so sure

AZ:

hmm it's a very interesting question let's just look at it without the bottom row for now since it's only a four letter word and then we'll try to find all the possibilities and then we just multiply by 2 since you can make those same patterns from the bottom upwards

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AZ:

For example, just a few I listed you can see how it's symmetrical but it would be easier this other way so we don't get confused

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crispyrat:

ok so how can we find all possibilities?

crispyrat:

do i have to find the number of possibilties for each letter? for example for the top row of o the possibilties for each one is 3?

AZ:

Like you said earlier, the o's can either be the first or second o in the word room But the easiest way would be to start with R and then see how many O's are next to it I guess |dw:1624560770568:dw| For this corner R, there's only one way to make ROOM do you see any other way?

crispyrat:

the r to the right?

AZ:

going to leave this clean copy just so it'll be easier to "reply using drawing" |dw:1624560999639:dw|

crispyrat:

|dw:1624561022485:dw|

AZ:

@crispyrat wrote:
the r to the right?
yeah definitely, the r in the right most corner would also have one way

crispyrat:

|dw:1624561072094:dw|

AZ:

okay, so now you started on the next R|dw:1624561080041:dw|

AZ:

just work with one R and then all the O's that it touches

crispyrat:

ok

@crispyrat wrote:
Created with RaphaëlReply Using Drawing
|dw:1624561165533:dw| is that all for that R?

crispyrat:

|dw:1624561198353:dw| here is all for that R i think?

AZ:

OH that last one is really good totally missed that

AZ:

so let's try to add it all up and make sure we get the symmetry right For the left most and right most R, there would be three ways |dw:1624561277465:dw|

crispyrat:

so there is 6 for those then for the second and fourth r there are |dw:1624561403682:dw| 6 for so in total 12? each i believe so 16 then 6 for the middle one?

AZ:

|dw:1624561346501:dw| there's a whole lot more dang

AZ:

|dw:1624561545257:dw| 5 + 7 = 12

crispyrat:

so 12 for each cus symmentry? so 24 in total for the 2nd and 4th r?

AZ:

yeah

crispyrat:

6 for left most and right most then 6 for oe in middle(idk if right for this one)

@crispyrat wrote:
so 12 for each cus symmentry? so 24 in total for the 2nd and 4th r?
6+6+24=36 36*2(because that is only the top=72 ways in total

AZ:

I think the center one is going to have a lot more so far we have 3 + 12 + center + 12 + 3 and then at the end we can multiply by 2 but first let's check the center

crispyrat:

|dw:1624561834108:dw|

AZ:

there's 10 ways just using the center O now if we use the diagonal O's then there's going to be more |dw:1624561806697:dw|

AZ:

6 more with the diagonals |dw:1624561921872:dw|

crispyrat:

so 16 in all?

AZ:

yeah, seems like it

crispyrat:

(16+3+12+3+12)*2=92?

AZ:

yup

crispyrat:

thank you!

AZ:

of course! :)

crispyrat:

@AZ oh it said it was wrong?

AZ:

we missed something hmm

AZ:

aha, we missed one and with symmetry it should add 4 to the total

AZ:

|dw:1624562389832:dw| that's six so far

crispyrat:

yes! 96 worked! can you show what path was missed?

@az wrote:
aha, we missed one and with symmetry it should add 4 to the total

AZ:

|dw:1624562434961:dw| that's four more

AZ:

I think we missed one of the orange paths

crispyrat:

oh yea i didn't notice that! thanks again :)

AZ:

and then 3 more to make the 2nd and 4th R to have a total of 13 |dw:1624562505637:dw|

AZ:

3 + 13 + 16 + 13 + 3 = 48 48 * 2 = 96

AZ:

@crispyrat wrote:
oh yea i didn't notice that! thanks again :)
It was my pleasure :)

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