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  1. There are 10 questions in a question paper. In how many ways, a student can solve there questions, if he solves one or more question ?
    1. 1024
    2. 1025
    3. 1023
    4. 1000
    5. None of the above
Correct Option: C

Required number of ways
= 2n - 1 = 210 - 1 = 1024 - 1 = 1023


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