Counting problems on the GMAT are not about memorizing complex factorial formulas. They are about making a series of logical decisions: Does order matter? Are there constraints? This guide will teach you the 'Slot Method' to solve even the hardest P&C questions intuitively.
The most critical step is the first one. Learn to distinguish between a 'Selection' (Combination) and an 'Arrangement' (Permutation) using our visual Team vs. Photo scenarios.
Stop using nPr and nCr formulas blindly. Learn the intuitive 'Countdown Method' (Slot Method) to calculate arrangements and selections faster and with fewer errors.
Real GMAT problems have rules. Learn how to handle scenarios where specific items MUST be chosen or MUST be excluded from the group.
How do you seat people if two friends refuse to be separated? Learn the 'Glue' technique to treat multiple items as a single unit.
Calculating 'Never Together' directly is messy. Learn the powerful shortcut of subtracting the 'Together' cases from the Total to find the answer instantly.
What happens when the items aren't unique (like the letters in MISSISSIPPI)? Learn how to adjust your calculation to account for duplicates.
In Data Sufficiency, your goal is not to find the number, but to determine if it CAN be found. Learn to spot the sufficiency without wasting time on massive calculations.
Don't just solve questions sequentially. Learn the error log method and how to use the OG for maximum score gains.
Why feeling the OG is easy is actually a sign of success, and how to use the 'Easy' questions to fix your pacing.
Forget formulas for a moment. Learn the 'Systematic Listing' method to build an unshakable intuition for Permutations & Combinations.
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