I'm attempting to use the countif formula to make sure a number is entered only once in 4 nonconnected ranges, I492:I496, I499:I503, K492:K496 and K499:K503. I've tried everything I know and as I'm self taught and my teacher is an idiot, I'm not having any luck. Any help will be very much appreciated as I'm down to the last 2 hairs on my head and one of them is already loose.![]()
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