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Maths Trick Riddle

I know a number which when multiplied by multiple of 9 i.e 9 18 27 36 45 ... the output consist of number containing only one digit. Can you identify the number ?


57 i think so but i am not sure
0 0 0
I know the answer
 answer is 123456789
if u multiply 9 to this no u will get 111111111 and u can see onle one digit is contained
 and so for all

1 5 1
i have given correct answer plz mark as brainiest answer plz
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