Q:

Select the odd group of numbers. (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g.13 – Operations on 13 such as adding /subtracting /multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed)

• 1
  (15 – 220 – 215)
• 2
  (10 – 100 – 95)
• 3
  (20 – 400 – 395)
• 4
  (25 – 625 – 620)