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To check divisibility by 11, subtract the sum of digits in odd positions from the sum of digits in even positions. The result must be divisible by 11. Number: 7 8 4 5 K 8 5 4 Positions: 1 2 3 4 5 6 7 8 Sum of odd positions (1,3,5,7): (7 + 4 + K + 5 = 16 + K) Sum of even positions (2,4,6,8): (8 + 5 + 8 + 4 = 25) Divisibility condition: [(16 + K) - 25 = {Multiple of 11}] K - 9 = 0 {Smallest multiple}) K = 9
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