Question

if f:N to N defined as f(x)=(-1)^n. write its range.
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Answer 1

Answer:

f(n)=2n+3 is a linear function.

Hence f(n  

1  )=f(n  2​)⇒n  1 =n2

​Here Domain is N but range is set of all odd number −{1,3}

Hence f(n) is injective or one-to-one function.