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  4. If the first digit of the 5 digit palindrome must be 1 and the middle one should be either 2 or 3, then number of such 5 digit numbers is divisible by

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Q. If the first digit of the 5 digit palindrome must be 1 and the middle one should be either 2 or 3, then number of such 5 digit numbers is divisible by

Permutations and Combinations

Solution:

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$(2) (10) (1) = 20$
$\Rightarrow 20$ is divisible by $1,2,4,5 A$