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Omni-MATH / Find the number of 10-digit numbers (a₁a₂⋯a₁₀)¯ which are multiples of 11 such that the digits are non-increasing from left to right, i.e. a_(i)≥a_(i+1) for each 1≤i≤9. · Discussion

Discussing Find the number of 10-digit numbers (a₁a₂⋯a₁₀)¯ which are multiples of 11 such that the digits are non-increasing from left to right, i.e. a_(i)≥a_(i+1) for each 1≤i≤9. · Omni-MATH

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