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Railways R.R.C. (Gorakhpur) Solved Paper Held on 1st Shift 23-11-2014

  • question_answer
    What is the sum of all whole numbers from 51 to 100?

    A) 4000                

    B) 3775

    C) 3500                            

    D) 3475

    Correct Answer: B

    Solution :

    Sum = 51+52+......+100 \[=\frac{50}{2}\,\,[2\times 51+(50-1)\times 1]\] \[=25\,\,[102+49]\] \[=25\times 151=3775\]


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