How many non zero digits are there in the hexadecimal number system?

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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
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