Question

    If  2,   7,  20,   x ,   110,    235,

    Then,  7 x + 7√x = ? In each of the following questions a number series is given.  One term of the series is denoted by X. You have to calculate the value of  X and by using the value of  X,  you have to replace the question mark (?) in the following questions :
    A 921 Correct Answer Incorrect Answer
    B 675 Correct Answer Incorrect Answer
    C 563 Correct Answer Incorrect Answer
    D 392 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    2 ×  2 + 3,   7 × 2 + 6,   20 × 2 + 9,   49 × 2 + 12,   110 × 2 + 15, 235 Hence, x= 49 Hence, 7 x + 7√x = 7 × 49 + 7√49 = 343 + 7 × 7 = 343 + 49 = 392

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