Let `A={1,2,3,4} and\ R={(a , b): a in A , b in A ,\ a` divides `b}` . Write `R` explicity.

Explanation

To find the relation \( R \) explicitly for the set \( A = \{1, 2, 3, 4\} \) where \( R = \{(a, b) : a \in A, b \in A, a \text{ divides } b\} \), we will follow these steps:

### Step 1: Identify the elements of set \( A \)
The set \( A \) consists of the elements:
\[ A = \{1, 2, 3, 4\} \]

### Step 2: Determine the ordered pairs \( (a, b) \) such that \( a \) divides \( b \)
We will check each element \( a \) in \( A \) and find all \( b \) in \( A \) such that \( a \) divides \( b \).
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