Question

these nos have a relation on both sides of':' . if a pair of no's on both sides of '::' follow the same relation then what will replace the ?
354: 4 :: 852:11 ::794:12::951:?

Answer 1

Add first two no's and subtract the third
3+5-4=4
8+5-2=11
7+9-4=12
9+5-1=13