I found the PM Formulas guide to be excellent. It provides a thorough and in-depth - yet concise - way to learn, review and completely understand all of the formulas needed for the PMP exam, all in one very handy guide.The sample formula-focused exam was also great - a fantastic confidence booster, as the questions really made sure you needed to understand the theory behind the numbers and formulas, rather than just knowing them "by heart". I highly recommend this product - it is high value, and money well spent!
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