RRB Group-D Model Paper 15 with answers for online practice

The pattern followed is,
Option 1 → 73 – 21 → 7 × 3 = 21
Option 2 → 56 – 30 → 5 × 6 = 30
Option 3 → 53 – 15 → 5 × 3 = 15
Option 4 → 22 – 6 → 2 × 2 = 4, not 6
All follow the same pattern, except 22 – 6.
Hence, “22 – 6” is the odd number pair.