Correct Answer: 75
Explanation:
Here in the given series, it follows a pattern that
77 + 2 = 79
79 - 3 = 76
76 + 5 = 81
81 - 7 = 74
74 + 11 = 85
Consecutive adding and subtracting of prime numbers.
So the wrong number in the given series is 75.
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