Math Problem Statement

Calculate the combinations: 3C2 and 3C3 using the formula and Pascal's Triangle.

Solution

The image contains two combination problems, and the combinations are being calculated using both the combination formula and Pascal's triangle.

The formula for calculating combinations is:

nCr=n!(nr)!r!^nC_r = \frac{n!}{(n - r)! r!}

where nn is the total number of items, and rr is the number of items to choose.

You are also provided with a Pascal's triangle, which helps simplify these calculations. For the combination values, you can find them in Pascal’s triangle by looking at row nn and selecting the rr-th element.

Problems:

  1. 3C2^3C_2
  2. 3C3^3C_3

Solving using Pascal's Triangle:

  • The third row of Pascal’s triangle (starting from row 0) is: 1,3,3,11, 3, 3, 1
  • 3C2^3C_2 is the third element in this row, which is 3.
  • 3C3^3C_3 is the fourth element in this row, which is 1.

Conclusion:

  1. 3C2=3^3C_2 = 3
  2. 3C3=1^3C_3 = 1

Would you like further details or explanations on this? Here are five related questions to expand this:

  1. What is the general use of Pascal’s Triangle in combinatorics?
  2. How can you derive the combination formula from Pascal’s Triangle?
  3. What is the significance of symmetry in Pascal’s Triangle?
  4. How would you calculate 4C2^4C_2 using the combination formula?
  5. Can you use Pascal's Triangle to calculate powers of binomials?

Tip: Pascal's Triangle is an efficient tool for quickly calculating combinations and also for expanding binomials in algebra.

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Math Problem Analysis

Mathematical Concepts

Combinatorics
Algebra
Pascal's Triangle

Formulas

Combination formula: nCr = n! / ((n - r)! * r!)

Theorems

Pascal's Triangle and its relationship to combinations

Suitable Grade Level

Grades 8-10