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...in his head in under 10 seconds. He reasoned thus:

**1**+**100**= 101 2 + 99 = 101 3 + 98 = 101 There are fifty such pairs, each adding up**to**101. 50 x 101 = 5,050.14 Answers · Science & Mathematics · 16/07/2007

...here goes your code: //comment

**to**make you more clear.. limit =**100**; // arbitrary search limit for (i = 2; i..._prime[i] = true // assume all**numbers**are prime at first } for (n...1 Answers · Computers & Internet · 22/01/2007

...then there are

**100***101/2 = 5050 dots which is also the sum from**1 to 100**.5 Answers · Science & Mathematics · 31/07/2011

...you have completed the above steps, all non-prime

**numbers numbers 1**-**100**have been eliminated.7 Answers · Science & Mathematics · 29/04/2010

... 50 odd

**numbers**and 50 even**numbers**from**1 to 100**inclusive. Since odd**numbers**... 2550 is the sum of the even**numbers**from 2**to 100**. I hope those help!! :-)3 Answers · Science & Mathematics · 26/08/2007

.... 0) efes

**1**) achat 2) shtayim 3) shalosh 4) arba...im 80) shmonim 90) tish'im**100**) me'a And again... by the rest of the**numbers**from left**to**right as the rightmost number...5 Answers · Travel · 22/03/2008

...the sum is the product of n and the even number between the two middle

**numbers**. For**1**-**100**, this works out**to**be 50. And for**1**- 1000, it does work out**to**be 418 (http://en.wikipedia...2 Answers · Science & Mathematics · 04/12/2009

From

**1 to 100**you have**100 numbers**. The average ...50-20 = 30 but since both end**numbers**are counted you add**1**. 30+**1**=31.**To**see this count the number...8 Answers · Science & Mathematics · 29/10/2007

Note: Zero and

**1**are not considered prime**numbers**! Prime**numbers**= {2,3,5,7,11,13, 17,...} 2... would yield number greater than**100**. Answer: 42 Answers · Science & Mathematics · 20/08/2011

...

**1**+2+3...+9+0) * 10 = 450 The second digit will go from**1**-9 for ten**numbers**each, and 0 once for**100**: (**1**+...+9)*10 = 450 The first digit is only**1**in the number...6 Answers · Science & Mathematics · 20/09/2012

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