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f maps each of 50 students to their roll number in N. Then f is
AOnto but not one-one
BOne-one but not onto
CNeither one-one nor onto
DBijective and invertible
Answer & Solution
Correct answer: B. One-one but not onto
Two students never share a roll number, but numbers such as 51 are used by nobody, so f misses part of N.
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