Problem

How many lines are determined by 16 points, no 3 of which are collinear? This que The number of lines is $\square$.

Solution

Step 1 :We are given 16 points, no 3 of which are collinear. We need to find out how many lines are determined by these points.

Step 2 :A line is determined by any two points. Since no three points are collinear, any two points will determine a unique line.

Step 3 :Therefore, the problem is equivalent to finding the number of combinations of 16 points taken 2 at a time.

Step 4 :This can be calculated using the combination formula: \(C(n, k) = \frac{n!}{(n-k)!k!}\), where n is the total number of items, k is the number of items to choose, and '!' denotes factorial.

Step 5 :Substituting the given values into the formula, we get \(C(16, 2) = \frac{16!}{(16-2)!2!}\).

Step 6 :Solving this, we find that the number of lines is 120.

Step 7 :Final Answer: The number of lines is \(\boxed{120}\).

From Solvely APP
Source: https://solvelyapp.com/problems/tQASlMNtH3/

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