Correct Answer - Option 1 : 63 : 80
NOTE: This is the official Question of SSC JE EE 29th Oct 2020 (Shift 2). This Question has two logic. But according to the official answer key, the correct answer is an option (1).
The pattern followed here is:
Multiplication of consecutive odd number : Multiplication of consecutive even numbers
35 : 48 → (5 × 7) : (6 × 8)
Similarly,
63 : 80 → (7 × 9) : (8 × 10)
Hence, "63 : 80" is the correct answer.