What is the number of ordered pairs (x, y) where x, y are positive integers such that the eight digit number 74x8935y is divisible by 11?

Correct option is D

Given:
Eight digit number: 74x8935y
The number is divisible by 11
x and y are positive integers
Formula Used:
A number is divisible by 11 if the difference between the sum of digits at odd positions and the sum of digits at even positions is either 0 or a multiple of 11.
Solution:
Sum of digits at odd places = 7 + x + 9 + 5 = 21 + x
Sum of digits at even places = 4 + 8 + 3 + y = 15 + y
Difference = (21 + x) - (15 + y) = 6 + x - y
For the number to be divisible by 11, the difference must be 0 or 11.
Case 1: 6 + x - y = 0
y - x = 6
Since x and y are positive integers (from 1 to 9), the possible pairs for (x, y) are (1, 7), (2, 8), and (3, 9). This gives 3 pairs.
Case 2: 6 + x - y = 11
x - y = 5
The possible pairs for (x, y) are (6, 1), (7, 2), (8, 3), and (9, 4). This gives 4 pairs.
Total number of ordered pairs = 3 + 4 = 7
Final Answer
So the correct answer is (d)