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Let A be the set of all 50 students of c...

Let A be the set of all 50 students of class XII in a central school. Let `f: A->N` be a function defined by `f(x)`=Roll number of student `x`. Show that `f` is one-one but not onto

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RD SHARMA ENGLISH-FUNCTION-All Questions
  1. Discuss the surjectivity of the following functions: f: R-> given by ...

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  2. Show that the function f: ZvecZ defined by f(x)=x^2+x for all x in Z ...

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  3. Let A be the set of all 50 students of class XII in a central school. ...

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  4. Show that the function f: RvecR defined by f(x)=3x^3+5 for all x in R...

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  5. Show that the function f: RvecR given by f(x)=cosxfora l lx in R , is...

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  6. Show that the function f: Rvec given by f(x)=x a+b , where a , b in R...

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  7. If f(x) = x/(sqrt(1+x^2) then fofof(x)

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  8. If f(x)=(3x-2)/(2x-3), prove that f(f(x)))=x for all x in R-{3/2} .

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  9. Show that f: RvecR , given by f(x)=x-[x], is neither one-one nor onto.

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  10. Let f: R-R be a function given by f(x)=a x+b for all x in R . Find th...

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  11. If f(x)=e^x and g(x)=(log)e x(x >0), find foga n dgofdot Is fog=gof?

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  12. If f:[0,oo)vecRa n dg: RvecR be defined as f(x)=sqrt(x) and g(x)=-x^2-...

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  13. Let f and g be real functions defined by f(x)=x/(x+1) a n d g(x)=1/(x...

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  14. If f(x)=sqrtx(x > 0) and g(x)=x^2-1 are two real functions, find fog a...

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  15. Let f: N-[1]vecN be defined by, f(n)= the highest prime factor ofn . S...

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  16. If f: Rvec is defined by f(x)=2x+7. Prove that f is a bijection. Also,...

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  17. If f:(-pi/2,pi/2)->R and g:[-1,1]->R be defined as f(x)=tanx a...

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  18. If f(x)=sin^2x+sin^2(x+pi/3)+cosxcos(x+pi/3)a n dg(5/4)=1, then (gof)...

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  19. Let f,g: R-R be two functions defined as f(x)=|x|+x and g(x)=|x|-x , f...

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  20. Let A={a,b,c,d} and f :A->A be given by f={(a,b),(b,d),(c,a),(d,c)} , ...

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