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.1-3 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)
Answer & explanation
Correct answer: option 1
(17 - 51 -147)
= 17 × 3 = 51 and 51 × 3 = 153 but 147 is given which is odd
(10 - 30 - 90)
= 10 × 3 = 30 and 30 × 3 = 90
(15 - 45 - 135)
= 15 × 3 = 45 and 45 × 3 = 135
(22 - 66 - 198)
= 22 × 3 = 66 and 66 × 3 = 198