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)

(7 - 343 - 331) (6 - 216 - 206) (5 - 125 - 115) (4 - 64 - 54)

(7 - 343 - 331)

☀ (7 - 343 - 331) =   7 ,  73 , 73 - 12 which is odd ☀ (6 - 216 - 206) =   6 , 63 , 63 - 10 ☀ (5 - 125 - 115) =  5 , 53 , 53 - 10 ☀ (4 - 64 - 54)  =     4 , 43 , 43 - 10