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    Question

    345      255      175      105      45   

      ? What should come in place of the question mark (?) in the following number series?    
    A 1 Correct Answer Incorrect Answer
    B -2 Correct Answer Incorrect Answer
    C -5 Correct Answer Incorrect Answer
    D 2 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    345 – 90 = 255 255 – 80 = 175 175 – 70 = 105 105 – 60 = 45 45 – 50 =  -5

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