How many 9 comes between 100 and 999
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109,119,129,139,149,159,169,179,189,190,191,192,193,194,195,196,197,198,199 = 20. From 101 to 200, 9 appears 20 times viz.109,119,129,139,149,159,169,179,189,190,191,192,193,194,195,196,197,198, and 199 (twice in 199). From 101 to 899, there are 160 nines. From 900to 999, there are 100+20=120 nines.
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