A grid has numbers in Nepali script. Row 1: 13, ?, 2. Row 2: 23, 87, 4. Row 3: 9, 10, 9. Find the missing number.

To find the missing number, we need to identify the pattern in the given grid.
The numbers in Nepali script are:
Row 1: १३ (13), ? , २ (2)
Row 2: २३ (23), ८७ (87), ४ (4)
Row 3: ९ (9), १० (10), ९ (9)

Let's analyze the relationship between the numbers in each row. We'll denote the numbers in a row as $N_1$, $N_2$, and $N_3$.

For Row 2: $N_1 = 23$, $N_2 = 87$, $N_3 = 4