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.
![**Exercise: Identifying Integers from a Set**
**Instructions:**
List the integers from the elements of the set \( B \).
**Given Set:**
\[ B = \{7, \sqrt{7}, -20, 0, -\frac{5}{8}, \frac{8}{5}, 1.5, \sqrt{16}\} \]
1. **Identify Integers:**
To determine which elements in the set are integers, look for numbers that do not have a fractional or decimal component, and whose square roots (if applicable) are also integers.
2. **Solution:**
- The element \( 7 \) is an integer.
- The element \( \sqrt{7} \) is not an integer because the square root of 7 is an irrational number.
- The element \( -20 \) is an integer.
- The element \( 0 \) is an integer.
- The element \( -\frac{5}{8} \) is not an integer because it is a fraction.
- The element \( \frac{8}{5} \) is not an integer because it is a fraction.
- The element \( 1.5 \) is not an integer because it is a decimal.
- The element \( \sqrt{16} \) is \(4\), and since 4 is an integer, \( \sqrt{16} \) is considered an integer.
3. **Conclusion:**
The integers from the set \( B \) are:
\[ \{7, -20, 0, 4\} \]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F909236e7-7530-4572-ad19-1af963edcdbe%2Ff2255d2c-57fe-4e61-b4d2-6f609a39126d%2Fbao8tq_processed.jpeg&w=3840&q=75)
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