In a certain code language 56789 is coded as 13579, then what will 78365 be coded as?

Correct option is A

To decode the pattern:

• 5 → 1 (subtract 4)
• 6 → 3 (subtract 3)
• 7 → 5 (subtract 2)
• 8 → 7 (subtract 1)
• 9 → 9 (no change)

Now applying the same pattern to 78365:

• 7 → 5 (subtract 2)
• 8 → 6 (subtract 2)
• 3 → 1 (subtract 2)
• 6 → 4 (subtract 2)
• 5 → 3 (subtract 2)

Thus, 78365 is coded as 56143.