Number 1,111,111,111

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[Math.]  1,111,111,1112 = 1,234,567,900,987,654,321.

 

[Math.]  137,174,210/1,111,111,111 = 0.(123 456 7890).

  

[Math.]

 1×1 = 1

11×11 = 121

111×111 = 12321

1111×1111 = 1234321

11111×11111 = 123454321

111111×111111 = 12345654321

1111111×1111111 = 1234567654321

11111111×11111111 = 123456787654321

111111111×111111111 = 12345678987654321

1111111111×1111111111 = 1234567900987654321.

 

[Math.]

1×9+2 = 11          

12×9+3 = 111      

123×9+4 = 1,111

1234×9+5 = 11,111

12,345×9+6 = 111,111

123,456×9+7 = 1,111,111

1,234,567×9+8 = 11,111,111

12,345,678×9+9 = 111,111,111 

123,456,789×9+10 = 1,111,111,111

1,234,567,900×9+11 = 11,111,111,111

or  1,234,567,901×9+  2 = 11,111,111,111...  

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