How many non zero digits are there in the hexadecimal number system?1.152.103.84.165.None of these

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• How many non zero digits are there in the hexadecimal number system?1.152.103.84.165.None of these
• How many non zero digits are there in the hexadecimal number system?
• SAT数学题关于排列组合求解答All seven digit telephone numbers in a certain town begin with 245.How many different telephone numbers may be assigned if the last four digits of each telephone number do not begin or end in a zero?我算的是C（2,9）乘C（2,10）（括号里第一个数字代表m第二个数字代表n）问题出在哪里了,应该怎样算,什么时候应该有组合C什么时候应该用排列P的公式,分不清有什么差别,求讲解我想的是后面四位数里 首位和末位不能为0 那有9种选择，中间两位有10种选择，这种想法错在哪里了？书后答案是8100，求讲解为什么关于问题我的翻译是，在一个城市所有七位数的电话号码前面三个数字是245，如果每个电话号码的后四位数字，首位和末位不可以为0，有多少种不同的电话号码可能被组合。我想用组合或排列
• 英语翻译第一篇Numbers:Everyone's language.How many languages do you know?Everyone knows at least two his or her own language and the international language of numbers.Ancient numbers In ancient times,people wrote numbers in many different ways,as these pictures of the number 6 show.However,they nearly all counted in the same way--in tens.Zero The system of numbers that nearly everyone uses today consists of the numbers from 1 to 9 and 0 (zero).With these ten
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• 1：The number of Internet users in Mexico between 2004 and 2008 can be modeled asu(t) = 8.02(1.17t) million users where t is the number of years since 2004.†(a) On average,what was the rate of change in the number of Internet users in Mexico between 2004 and 2006?(Round your answer to three decimal places.__________million users per year(b) What was the percentage change in the number of Internet users in Mexico between 2004 and 2006?(Round your answer