最新GRE数学预测模拟试题（三）第一题

最新GRE数学预测模拟试题（三）第一题a number is a palindrome if it reads exactly the same from right to left as it does from left to right, for example 959 and 24742 are palindromesA: the probaility that a three dight number chosen at random is a palindromeB: 1\/10答案怎么能是相等呢 三位数的话百位上应该是C9 1,是九个呀,0不能当百位呀,十位是 C 10 1,各位就是百位不用算 三位数有1000个,那么应该是 90/1000 是9/100呀 求解