Correct Answer: 6
Explanation:
879 ⇒ (7 + 9) - 8 = 8 625 ⇒ (2 + 5) - 6 = 1 and 586 ⇒ (8 + 6) - 5 = 9 Similarly, 785 ⇒ (8 + 5) - 7 = 6
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