If we toss three coins 240 times, how many times can we expect the coins to have three tails showing?
How many strings of three digits are there? 000 to 999, or a total of 1000. How many strings of three digits contain the same three digits? That's 000, 111, 222 ... 999! ten in total. The difference is your answer: 1000-10 = 990.
Four outcomes, three combinations.
There are only 999 three digit whole numbers.
3 non-collinear points define one plane.
exactly one and only one.
1, exactly 1 plane will
Only one plane can pass through 3 non-collinear points.
The answer depends on the number of point. One point - as the question states - cannot be non-collinear. Any two points are always collinear. But three or more points will define a plane. If four points are non-coplanar, they will define four planes (as in a tetrahedron).
Just one plane.