1 Reason:in first line it was given that 1=5

If 1=5, 2=7, 3=9, 4=13 then 5=??

5=17

If 1=5 Then 5=1

If 1,4,3=13; 4,5,4=9; 5,6,5=11 and 7,7,6=7 then 9,8,7=?

If

2 3 = 9 5 4 = 26 6 2 = 13

Then

7 4 = ??