Which pair of measure cannot be calculated when one of numbe

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4 + 14 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.

Which pair of measure cannot be calculated when one of numbers in the series is zero?

G. M. and A. M.

None of these

G. M. and H. M.

H. M. and A. M.