Write out all the combinations if there were 3 items on the menu.
If you write out all the combinations, you will see.
So then why is it not 200.
This same question was asked, but they could choose the same dish. CPhill got the answer of 100, and not 200.
https://web2.0calc.com/questions/help-plz_112
Yann can order from 10 dishes, but Camille can only order 9 because she cannot choose the same dish as Yann. So 10*9=90
If the period in the middle of your question means to multiply, here is your answer:
(2/3)^-2*(2/3)^-3
(2/3)^-5
3^5/2^5
243/32
Here is another link where your same question was asked: https://www.quora.com/If-you-roll-two-fair-six-sided-dice-what-is-the-probability-that-at-least-one-die-shows-a-3
Sometimes when you copy and paste a question onto this website, some of the question does not show up. To fix this, you have to copy and paste the question into the Google search bar, copy that, then paste it onto this website.
Here is a similar question with an answer: https://web2.0calc.com/questions/a-circle-is-tangent-to-the-y-axis-at-the-point-0
Sorry, but 17 is also wrong.
