Explanation:

Here’s a breakdown to find the number of pairs of digits in the number 839456:

- We need to find pairs with the same number of digits between them as there are between corresponding numbers in a natural sequence.

- In the sequence, consider the difference between their positions.

- Example: For digits like 3 and 9, they have five numbers between them in a sequence — 4, 5, 6, 7, 8.

- Check each pair:

- 8 and 9: 0 number between (not valid)

- 3 and 4: 0 number between (valid)

- 3 and 5: 1 number between (not valid)

- 3 and 9: 5 numbers between (valid)

- 9 and 4: 3 numbers between (valid)

- 4 and 5: 0 number between (valid)

- 5 and 6: 0 number between (valid)

- Total valid pairs are four in number.

Correct Answer: Option 4: More than three