Did you know that the sum of digits which make-up all multiples of number "9", is 9!!
Examples.
9×2 =18 then 1+8 =9.
9×7 =63 then 6+3 =9.
9×60 =540 then 5+4+0 =9.
9×3 =27 then 2+7 =9.

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