## Sum of Digit of A where A is composed of Addends involving 9s Trick

SASMO Question in Image below Solution 21) Notice that 9 = 10 – 1 99 = 100 – 1 999 = 1000 – 1 . . . 999…999 (2017 digits) = 10^2017 – 1 So A = (10^1 + 10^2 + 10^3 + …...

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