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Really?

Ok, think of it this way, a number consist of only 2 digit (with out decimal) add only up to the second digit of another number. Namely

249

10 then subtract them digit by digit.

9 - 0 = 9 (property of 0)

4 - 1 = 3 (definition of successor)

2 have nothing below it as of now

so you get

239

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14y ago

What else can I help you with?