GRE Quantitative Flashcards: Counting Combinatorics

Study Counting Combinatorics in GRE Quantitative with focused flashcards that help you recognize the idea, recall the key rule, and apply it in practice-style prompts.

QUESTION

What is the value of $0!$ ?

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ANSWER

$0!=1$ . Defined by convention to ensure consistency in formulas like binomial coefficients and permutations for $r=0$ .

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What this deck covers

This deck focuses on Counting Combinatorics, giving you a quick way to review the definitions, rules, and examples that matter most for GRE Quantitative.

How to use these flashcards

Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

Practice questions

1 of 17Practice questions for this set

A bookstore will create a display by arranging 5 different books in a row on a shelf. Two particular books,

A

and

B

, must not be adjacent. How many arrangements are possible?

Choose an answer

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