Special sequence

What if
           2×9=1
           3×9=2
           4×9=3
           5×9=4
           6×9=5
           7×9=6
           8×9=7
           9×9=8
          10×9=9
   then 1×9=???

answer with solutions. .. ..

Correct answer:

x =  0

Step-by-step explanation:

x=0



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