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in Olympiad by (72.3k points)

Let ∈ {1,2,3........9}. The number of such n, for which there is at least one permutation of the digits 1,2....n which is divisible by 11 is

(A) 3 

(B) 4 

(C) 5 

(D) 6

1 Answer

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Best answer

Correct option: (C) 5

Explanation:

n can be 3(132) or 4(1243) or 7(2136475) or 8(13862475) or 9(142738695)

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