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Q.

Find the number of 7 digit numbers using 0 to 9 which are palindrome when repetition is allowed?

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a

9×103

b

9×106

c

None

d

103

answer is C.

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Detailed Solution

A string is called a palindrome when read from left to right and right to left, it remain same.

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⇒Total palindromes are ⇒9×103

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