We have a simple list of 4-digit alphanumeric codes like A001, A002, A003, etc. What formula can we use to mark codes are "out of sequence" with previous entries? This problem includes two separate challenges.
In this formula challenge, we have data showing cups of coffee sold at a small kiosk for a week. What formula will look up and sum total cups sold after 12:00 PM on Tuesday and Thursday? Relevant cells are shaded in green.