N a certain test, there are n question. ...

N a certain test, there are `n` question. In the test, `2^(n-i)` students gave wrong answers to at least `i` questions, where `i=1,,2ddot,ndot` if the total number of wring answers given is 2047, then `n` is equal to a. `10` b. `11` c. `12` d. `13`

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