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

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