How many are these white pants错在哪里

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• 阅读短文,判断句子,在括号里用T（对）或F（错）标明.The Fox and the GrapesA fox is looking for food.He is very hungry.Now he is stopping and looking up.He sees a lot of fine grapes at the top of the wall."How nice they are!I want to eat them."The fox jumps and jumps,but the wall is too high.He can't get the grapes.The fox goes away and says,"I don't like those grapes.They are not good to eat."( )1.The fox is playing near the wall.( )2.There are many nice grapes at the top of
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• how many is the apple 错在哪里
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• How many orange jam are there in the bottle?错在哪里?怎么改?
• 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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