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    Question

    In each of the following number series, one term is

    missing. Find the missing term. 4, 9, 19, 39, 79, ?
    A 115 Correct Answer Incorrect Answer
    B 159 Correct Answer Incorrect Answer
    C 172 Correct Answer Incorrect Answer
    D 100 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Pattern: each term = (previous term Γ— 2) + 1 4 β†’ 4Γ—2+1 = 9 9 β†’ 9Γ—2+1 = 19 19 β†’ 19Γ—2+1 = 39 39 β†’ 39Γ—2+1 = 79 Next term = 79Γ—2 + 1 = 158 + 1 = 159

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