PASSAGE-VIII: A palindrome is a finite sequence of characters that reads the same forward and backwards (ALABABALA). Then 7 digit palindromes, under the restriction that no digit may appear more than twice is 21. A) 1 0 ,, B) 9,, C) 9,, D) 9 .9 The number of8 digit palindromes under the same condition of the above problem is C) 9 ,, D) 9 .9 P 4 P3 P4 P 3 22. A) 8 ,, B) 9 p, C) 9 .9 p, D) 9.9P. С) 9.9 Рз P 4 Let x,x,X3X4X5 X4X3X,X, be a nine digit palindrome such that either the sequence 23. {x, X2,X3, X4, X3} is a strictly ascending or strictly decending. Then the number of such palindromes is A) 9.9, B) 3.9p5 P4 C) 9c5.9 D) 3×9c5

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