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B
onto only
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C
bijective
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D
neither one-one nor onto
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Solution
The correct option is C bijective f(x)=x+3 f(x) is monotonically increasing function. So f(x) is one - one. Also f(x) takes the value of all natural numbers except {1,2,3} in its domain. Here range = codomain So f(x) is onto also. Thence, it is bijective.