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ok so for every point i start with, i can make 7 triangles that go over the center

if i remove the over countin i get 21 different triangles

so the probability should be 21/ 85?

sorry, 21/84 = 1/4?

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sorry, 21/84 = 1/4?

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Understand this part?

Now, calculate sample space.

How many sample space do you have?

(OUTCOME)

i can create 84 different triangles in total

Yes,

among them, how many of the triangles include the center?

but now now im getting12 per point, and 12*9/3= 36 different triangles in total. so 36/84

ok, you got it.

and ganeshie gave you the general form also.

yes, but i, not sure how he got it and i need to include an explanation...

So, you have to wait for him, hehehe..

haha i suppose so

thanks so much once again! you're a great teacher!

i just need part b. Any help is appreciated :D

I'll tag @ganeshie8 for you, that way I get to see the post as well hehe ;).