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# What is the sum of digits in decimal notation of number

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What is the sum of digits in decimal notation of number [#permalink]

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06 Nov 2007, 11:10
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What is the sum of digits in decimal notation of number (10^20) - 16?

158
456
156
174
176
VP
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06 Nov 2007, 11:21
bmwhype2 wrote:
What is the sum of digits in decimal notation of number (10^20) - 16?

158
456
156
174
176

100000000000000000000-16=99999999999999999984
9*18+8+4=174
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06 Nov 2007, 11:21
100 = 10^2 (one and two zeros)

10^20 = (one and 20 zeros)

hence:

10^20 - 16 = 18 nines, an eight and four.

18*9+8+4 = 174

06 Nov 2007, 11:21
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