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Logical Reasoning: Coding & Series Flashcards

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

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  1. If PENCIL is coded as RGPEKN, how is RUBBER coded? (each letter shifted by +2)

    Answer: TWDDGT

    Each letter shifted +2: R+2=T, U+2=W, B+2=D, B+2=D, E+2=G, R+2=T = TWDDGT.

  2. Find the next term in the series: 2, 6, 12, 20, 30, ?

    Answer: 42

    Differences: 4, 6, 8, 10, 12. Next term = 30 + 12 = 42.

  3. What comes next in the Fibonacci-like series: 1, 1, 2, 3, 5, 8, 13, ?

    Answer: 21

    Each term is the sum of the two preceding terms: 8 + 13 = 21.

  4. Find the odd one out: 4, 9, 16, 25, 35, 49

    Answer: 35

    4=2^2, 9=3^2, 16=4^2, 25=5^2, 49=7^2 are all perfect squares. 35 is not a perfect square.

  5. Find the next number: 3, 7, 15, 31, 63, ?

    Answer: 127

    Pattern: each term = 2 × previous + 1. 2×63+1 = 127.

  6. In a series A, C, E, G, I, the next term is:

    Answer: K

    The series consists of every other letter: A(1), C(3), E(5), G(7), I(9), K(11).