Which term of the AP : 3, 8, 13, 18, . . . , is 78?

Explanation

To find which term of the arithmetic progression (AP) 3, 8, 13, 18, ... is equal to 78, we can follow these steps:

### Step 1: Identify the first term (A) and common difference (d)
- The first term \( A \) of the AP is 3.
- The common difference \( d \) can be calculated by subtracting the first term from the second term:
\[ d = 8 - 3 = 5 \]
...