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Number and Letter Sequences Flashcards

7 cards from real GCAT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Number and Letter Sequences flashcards as text

  1. What is missing? 5, 10, 20, ___, 80, 160

    Answer: 40

    Each term is multiplied by 2, so 20 × 2 = 40.

  2. Which letter is next? A, C, F, J, O, ___

    Answer: U

    The gaps increase by 1 each step (+2, +3, +4, +5, +6), so O + 6 = U.

  3. What number fills the blank? 81, 27, 9, 3, ___

    Answer: 1

    Each term is divided by 3, so 3 ÷ 3 = 1.

  4. Identify the next term: A1, B2, C3, D4, ___

    Answer: E5

    The letter advances by one and the number increases by one, giving E5.

  5. What comes next? 7, 14, 21, 28, 35, ___

    Answer: 42

    These are multiples of 7, so the next term is 7 × 6 = 42.

  6. Which letter continues? B, E, H, K, N, ___

    Answer: Q

    Each letter skips 2 positions (+3 steps), so N + 3 = Q.

  7. What is the next number? 0, 1, 3, 6, 10, 15, ___

    Answer: 21

    These are triangular numbers; differences increase by 1 each time (+1,+2,+3,+4,+5,+6), giving 15 + 6 = 21.