15. Which houses have an area of exactly 82 square inches? Select all that apply. 5 in 3 in zin 15 in A. 6 in 9 in 7 in 3 in В. 8 in 11 in 10 in C. 6 in 12 in 11 in D. 7 in 13in 6 in 10 in raft
Permutations and Combinations
If there are 5 dishes, they can be relished in any order at a time. In permutation, it should be in a particular order. In combination, the order does not matter. Take 3 letters a, b, and c. The possible ways of pairing any two letters are ab, bc, ac, ba, cb and ca. It is in a particular order. So, this can be called the permutation of a, b, and c. But if the order does not matter then ab is the same as ba. Similarly, bc is the same as cb and ac is the same as ca. Here the list has ab, bc, and ac alone. This can be called the combination of a, b, and c.
Counting Theory
The fundamental counting principle is a rule that is used to count the total number of possible outcomes in a given situation.
![### Geometry Problem: Finding the Area of Composite Shapes
**Problem Statement:**
**15. Which houses have an area of exactly 82 square inches? Select all that apply.**
Below are four different composite shapes represented as houses (A, B, C, and D). Each house is made up of basic geometric shapes such as rectangles or triangles. The dimensions for each component of the houses are provided. Determine which of the houses have a total area of exactly 82 square inches.
#### House A:
- Consists of a rectangle at the bottom and a triangular section on top.
- **Bottom rectangle dimensions:**
- Width: 9 inches
- Height: 6 inches
- **Top triangular section dimensions:**
- The base is divided into 3 inches and 2 inches, with the height being 5 inches.
**Area Calculation:**
- Rectangle: \( 9 \text{ in} \times 6 \text{ in} = 54 \text{ square inches} \)
- Triangle: \( \frac{1}{2} \times (3 + 2) \text{ in} \times 5 \text{ in} = \frac{1}{2} \times 5 \text{ in} \times 5 \text{ in} = 12.5 \text{ square inches} \)
- **Total area for House A:** \( 54 + 12.5 = 66.5 \text{ square inches} \)
#### House B:
- Consists of a rectangle with a trapezoid on top.
- **Bottom rectangle dimensions:**
- Width: 11 inches
- Height: 8 inches
- **Top trapezoid dimensions:**
- Top base: 7 inches
- Bottom base: 11 inches
- Height: 3 inches
**Area Calculation:**
- Rectangle: \( 11 \text{ in} \times 8 \text{ in} = 88 \text{ square inches} \)
- Trapezoid: \( \frac{1}{2} \times (7 \text{ in} + 11 \text{ in}) \times 3 \text{ in} = \frac{1}{2} \times 18 \text{ in} \times 3 \text{ in} = 27 \text{ square inches} \)
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