Look at the series and complete it: 72,76,73,77,74….,75

Look at the series and complete it: 72,76,73,77,74….,75

Explanation

Look at the series and complete it: 72,76,73,77,7, 78,.75

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72+4=76

76-3=73

73+4=77

77-3=74

74+4=78

78-3=75