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
Except option 2 all are following the same pattern :
that is
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(405 - 400 - 395) = 405 , 405-5 , 405 -10
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(700 - 690 - 685) = 700 , 700- 10 , 700 -15 which is ODD
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(550 - 545 - 540) = 550 , 550 - 5 , 550 -10
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(620 - 615 - 610) = 620 , 620 -5 , 620 - 10