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)
Answer & explanation
Correct answer: option 2
The logic followed here is :
Ist number × 10 = second number and second number - 10 = third number
(6 - 60 - 50)
6 × 10 = 60 and 60 - 10 = 50
(8 - 80 - 70)
8 × 10 = 80 and 80 - 10 = 70
(9 - 90 -80)
9 × 10 = 90 and 90 - 10 = 80
Except option 2
(7 - 70 - 68)
9 × 10 = 90 and 90 - 10 = 80 which is odd