show that if a palindrome is 4 digits it would divisible by 11
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The palindrome number with four digits takes the form abba. Here, the first digit can be chosen in 9 ways (1,2,3,4,5,6,7,8,9) and second in 10 ways (0,1,2,3,4,5,6,7,8,9) and the other two digits can be chosen on the basis of first two digits.
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