138 356
? 742

• for left most and right most digits it will be in the sequence of
  1 3 5 7 for left most and
  8 6 4 2 for right most
  now for centered digits it might be as follows
  for 138 1+3=4, 4*2=8
  for 356 3+5=8, 8*2=16 taking only unit place i.e. 6
  for 742 7+4=11, 11*2=22 taking only unit place i.e. 2 and now
  for 5_4 5+7=12, 12*2=24 taking only unit place i.e. 4
  so ans might be 574
• 11 years agoHelpfull: Yes(4) No(0)
• 1+2=3 similarly 5+2=7
  3+2=5 2+2=4
  8-2=6 4-2=2
  s0 answer might be 524
• 11 years agoHelpfull: Yes(2) No(2)