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    Question

    A series is 11, 20, 42, 82, 166, 330 If another

    series 4, a, b, c, d, 106 follows the same pattern as the given number series, then find the approximate value of (c + d) x (c – a)%.
    A 10 Correct Answer Incorrect Answer
    B 16 Correct Answer Incorrect Answer
    C 17 Correct Answer Incorrect Answer
    D 19 Correct Answer Incorrect Answer
    E 20 Correct Answer Incorrect Answer

    Solution

    11, 20, 42, 82, 166, 330 11 x 2 – 2 = 20 20 x 2 + 2 = 42 42 x 2 – 2 = 82 82 x 2 + 2 = 166 166 x 2 – 2 = 330 So, we will follow same pattern in series 4, a, b, c, d, 106. 4 x 2 – 2 = 6 (a) 6 x 2 + 2 = 14 (b) 14 x 2 – 2 = 26 (c) 26 x 2 + 2 = 54 (d) 54 x 2 – 2 = 106 Now, (c + d) x (c – a)% => (26 + 54) x (26 – 6)% => 80 x 20/100 = 16

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