Question

how can it possible then 19-1=20?​

Answer 1

Its 19 + 1 = 20

NOT:

19 - 1 = 20

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Answer 2

Answer :

19 - 1 = 20

Write the numbers in the roman form

19 = XlX

1 = l

19 - 1 = 20

XlX - l = XX

XX = XX

Hence, proved 19 - 1 = 20