567 The pattern is that the sum of the first and third digits is multiplied by the second digit to get the missing number. For example: 1 + 3 = 4 4 * 2 = 8 So, for the given series: 1 + 5 = 6 6 * 2 = 12- -> 12 should be in parentheses 2 + 4 = 6 6 * 3 = 18- -> 18 should be in parentheses 3 + 5 = 8 8 * 4 = 32- -> 32 should be in parentheses 4 + 6 = 10 10 * 5 = 50- -> 50 should be in parentheses 7 + 9 = 16 16 * 8 = 128- -> 128 should be in parentheses Hence, the missing number is 567.

總結

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